fix(golang): set v2.10.0-dev version for OtlpRuntimeMetrics and fix formatting

Replace missing_feature removal with v2.10.0-dev version tag (dd-trace-go#4803
was merged after version was bumped to v2.10.0-dev). Fix ruff formatting: restore
double blank line before module-level function and remove trailing newline.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: anna-git

manifests/golang.yml

@@ -1445,6 +1445,7 @@ manifest:
   tests/test_library_logs.py::Test_NoExceptions::test_dotnet: irrelevant (only for .NET)
   tests/test_library_logs.py::Test_NoExceptions::test_java_logs: irrelevant (only for Java)
   tests/test_library_logs.py::Test_NoExceptions::test_java_telemetry_logs: irrelevant (only for Java)
+  tests/test_otlp_runtime_metrics.py::Test_OtlpRuntimeMetrics: v2.10.0-dev
   tests/test_profiling.py::Test_Profile::test_process_tags_svc: missing_feature
   tests/test_protobuf.py: missing_feature
   tests/test_resource_renaming.py:

tests/test_otlp_runtime_metrics.py

@@ -238,6 +238,7 @@ class MetricConstraints(TypedDict, total=False):
     "java": "jvm.heap_memory",
 }
 
+
 def get_runtime_metrics_by_name() -> dict[str, list[dict[str, str]]]:
     """Return observed runtime metrics grouped by name.
 
@@ -330,4 +331,3 @@ def test_dd_metrics_are_absent(self) -> None:
         assert len(dd_named_metrics) == 0, (
             f"Found DD-proprietary metric names for {library}: {dd_named_metrics}. Expected OTel-native names only."
         )
-