[aks-preview] Fix OTLP live tests: remove rejected aksHTTPCustomFeatures header

The AzureMonitorAppMonitoringPreview capability is gated by subscription feature
registration, not by a per-request AKSHTTPCustomFeatures header. The resource
provider now rejects that header with '(BadRequest) Parameter aksHTTPCustomFeatures
is not allowed', causing every OpenTelemetry @live_only scenario to fail before
reaching its assertions.

Removes '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview'
from the six OpenTelemetry live tests. Verified live that create/update with the
OTLP flags succeeds once the header is dropped (feature registered on the
subscription). The recorded app-monitoring tests are left unchanged, as they
replay a cassette that still contains the header.

Author: Christoph Butz

src/aks-preview/azext_aks_preview/tests/latest/test_aks_commands.py

@@ -16344,7 +16344,7 @@ def test_aks_create_with_azuremonitorlogs_and_opentelemetry(self, resource_group
         create_cmd = (
             'aks create --resource-group={resource_group} --name={name} --location={location} --ssh-key-value={ssh_key_value} --node-vm-size={node_vm_size} '
             '--enable-managed-identity --enable-azure-monitor-logs --enable-opentelemetry-logs-traces --opentelemetry-logs-traces-port-http=8080 --opentelemetry-logs-traces-port-grpc=8082 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview --output=json'
+            '--output=json'
         )
         self.cmd(create_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -16387,7 +16387,6 @@ def test_aks_update_with_azuremonitorlogs_and_opentelemetry(self, resource_group
         update_cmd = (
             'aks update --resource-group={resource_group} --name={name} --yes --output=json '
             '--enable-azure-monitor-logs --enable-opentelemetry-logs-traces --opentelemetry-logs-traces-port-http=9090 --opentelemetry-logs-traces-port-grpc=9092 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview'
         )
         self.cmd(update_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -16583,7 +16582,7 @@ def test_aks_create_with_azuremonitormetrics_and_opentelemetry(self, resource_gr
         create_cmd = (
             'aks create --resource-group={resource_group} --name={name} --location={location} --ssh-key-value={ssh_key_value} --node-vm-size={node_vm_size} '
             '--enable-managed-identity --enable-azure-monitor-metrics --enable-opentelemetry-metrics --opentelemetry-metrics-port-http=8080 --opentelemetry-metrics-port-grpc=8082 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview --output=json'
+            '--output=json'
         )
         self.cmd(create_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -16640,7 +16639,6 @@ def test_aks_update_with_azuremonitormetrics_and_opentelemetry(self, resource_gr
         update_cmd = (
             'aks update --resource-group={resource_group} --name={name} --yes '
             '--enable-azure-monitor-metrics --enable-opentelemetry-metrics --opentelemetry-metrics-port-http=9090 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview '
             '--output=json'
         )
 
@@ -16766,7 +16764,7 @@ def test_aks_create_with_opentelemetry_deprecated_flag_aliases(self, resource_gr
             '--enable-managed-identity --enable-azure-monitor-logs --enable-azure-monitor-metrics '
             '--enable-opentelemetry-logs --opentelemetry-logs-port=8080 '
             '--enable-opentelemetry-metrics --opentelemetry-metrics-port=8081 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview --output=json'
+            '--output=json'
         )
         self.cmd(create_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -16945,7 +16943,7 @@ def test_aks_comprehensive_monitoring_integration(self, resource_group, resource
             '--enable-opentelemetry-logs-traces --opentelemetry-logs-traces-port-http=8080 --opentelemetry-logs-traces-port-grpc=8082 '
             '--enable-opentelemetry-metrics --opentelemetry-metrics-port-http=8081 --opentelemetry-metrics-port-grpc=8083 '
             '--enable-windows-recording-rules '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview --output=json'
+            '--output=json'
         )
         self.cmd(create_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -17056,7 +17054,6 @@ def test_aks_comprehensive_monitoring_integration(self, resource_group, resource
             'aks update --resource-group={resource_group} --name={name} --yes --output=json '
             '--enable-opentelemetry-logs-traces --opentelemetry-logs-traces-port-http=9090 --opentelemetry-logs-traces-port-grpc=9092 '
             '--enable-opentelemetry-metrics --opentelemetry-metrics-port-http=9091 --opentelemetry-metrics-port-grpc=9093 '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview'
         )
         self.cmd(update_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),
@@ -17148,7 +17145,6 @@ def test_aks_comprehensive_monitoring_integration(self, resource_group, resource
             '--enable-opentelemetry-logs-traces --opentelemetry-logs-traces-port-http=7070 --opentelemetry-logs-traces-port-grpc=7072 '
             '--enable-opentelemetry-metrics --opentelemetry-metrics-port-http=7071 --opentelemetry-metrics-port-grpc=7073 '
             '--enable-windows-recording-rules '
-            '--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AzureMonitorAppMonitoringPreview'
         )
         self.cmd(update_cmd, checks=[
             self.check('provisioningState', 'Succeeded'),