Simplify memoryMode assertions to exact value

All builder classes hardcode DEFAULT_MEMORY_MODE = MemoryMode.REUSABLE_DATA,
so the regex alternation (IMMUTABLE_DATA|REUSABLE_DATA) is unnecessary.
Using the exact value makes the tests more precise.

Author: trask

exporters/otlp/all/src/testDefaultSender/java/io/opentelemetry/exporter/otlp/http/metrics/OtlpHttpMetricExporterOkHttpSenderTest.java

@@ -103,7 +103,7 @@ void stringRepresentation() {
                   + "internalTelemetrySchemaVersion=LEGACY, "
                   + "aggregationTemporalitySelector=AggregationTemporalitySelector\\{.*\\}, "
                   + "defaultAggregationSelector=DefaultAggregationSelector\\{.*\\}, "
-                  + "memoryMode=(IMMUTABLE_DATA|REUSABLE_DATA)"
+                  + "memoryMode=REUSABLE_DATA"
                   + "\\}");
     }
   }

exporters/otlp/all/src/testDefaultSender/java/io/opentelemetry/exporter/otlp/http/trace/OtlpHttpSpanExporterOkHttpSenderTest.java

@@ -50,7 +50,7 @@ void stringRepresentation() {
                   + "componentLoader=.*, "
                   + "exporterType=OTLP_HTTP_SPAN_EXPORTER, "
                   + "internalTelemetrySchemaVersion=LEGACY, "
-                  + "memoryMode=(IMMUTABLE_DATA|REUSABLE_DATA)"
+                  + "memoryMode=REUSABLE_DATA"
                   + "\\}");
     }
   }

exporters/otlp/all/src/testDefaultSender/java/io/opentelemetry/exporter/otlp/metrics/OtlpGrpcMetricExporterTest.java

@@ -103,7 +103,7 @@ void stringRepresentation() {
                   + "internalTelemetrySchemaVersion=LEGACY, "
                   + "aggregationTemporalitySelector=AggregationTemporalitySelector\\{.*\\}, "
                   + "defaultAggregationSelector=DefaultAggregationSelector\\{.*\\}, "
-                  + "memoryMode=(IMMUTABLE_DATA|REUSABLE_DATA)"
+                  + "memoryMode=REUSABLE_DATA"
                   + "\\}");
     }
   }

exporters/otlp/all/src/testDefaultSender/java/io/opentelemetry/exporter/otlp/traces/OtlpGrpcSpanExporterTest.java

@@ -50,7 +50,7 @@ void stringRepresentation() {
                   + "componentLoader=.*, "
                   + "exporterType=OTLP_GRPC_SPAN_EXPORTER, "
                   + "internalTelemetrySchemaVersion=LEGACY, "
-                  + "memoryMode=(IMMUTABLE_DATA|REUSABLE_DATA)"
+                  + "memoryMode=REUSABLE_DATA"
                   + "\\}");
     }
   }

exporters/otlp/all/src/testJdkHttpSender/java/io/opentelemetry/exporter/otlp/http/metrics/OtlpHttpMetricExporterJdkSenderTest.java

@@ -104,7 +104,7 @@ void stringRepresentation() {
                   + "internalTelemetrySchemaVersion=LEGACY, "
                   + "aggregationTemporalitySelector=AggregationTemporalitySelector\\{.*\\}, "
                   + "defaultAggregationSelector=DefaultAggregationSelector\\{.*\\}, "
-                  + "memoryMode=(IMMUTABLE_DATA|REUSABLE_DATA)"
+                  + "memoryMode=REUSABLE_DATA"
                   + "\\}");
     }
   }