chore(o11y): remove beta api from observability classes (#12747)

This PR remove `@BetaApi` from observability classes. `@InternalApi`
annotations are also removed because they are either package private or
need to be used externally.

Author: blakeli0

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/LoggingTracer.java

@@ -30,8 +30,6 @@
 
 package com.google.api.gax.tracing;
 
-import com.google.api.core.BetaApi;
-import com.google.api.core.InternalApi;
 import com.google.api.gax.logging.LoggerProvider;
 import com.google.api.gax.logging.LoggingUtils;
 import com.google.common.annotations.VisibleForTesting;
@@ -44,8 +42,6 @@
  * An {@link ApiTracer} that logs actionable errors using {@link LoggingUtils} when an RPC attempt
  * fails.
  */
-@BetaApi
-@InternalApi
 class LoggingTracer extends BaseApiTracer {
   private static final LoggerProvider LOGGER_PROVIDER =
       LoggerProvider.forClazz(LoggingTracer.class);

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/LoggingTracerFactory.java

@@ -30,7 +30,6 @@
 
 package com.google.api.gax.tracing;
 
-import com.google.api.core.BetaApi;
 import com.google.api.core.InternalApi;
 import com.google.api.gax.logging.LoggingUtils;
 import com.google.common.annotations.VisibleForTesting;
@@ -41,7 +40,6 @@
  * managed automatically by the system, when {@link LoggingUtils#isLoggingEnabled()} returning
  * {@code true}.
  */
-@BetaApi
 @InternalApi
 public class LoggingTracerFactory implements ApiTracerFactory {
   private final ApiTracerContext apiTracerContext;

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryMetricsFactory.java

@@ -29,17 +29,13 @@
  */
 package com.google.api.gax.tracing;
 
-import com.google.api.core.BetaApi;
-import com.google.api.core.InternalApi;
 import io.opentelemetry.api.OpenTelemetry;
 
 /**
  * A {@link ApiTracerFactory} to build instances of {@link OpenTelemetryMetricsTracer}.
  *
  * <p>This class is expected to be initialized once during client initialization.
  */
-@BetaApi
-@InternalApi
 public class OpenTelemetryMetricsFactory implements ApiTracerFactory {
 
   private final ApiTracerContext clientLevelTracerContext;

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryTracingFactory.java

@@ -31,8 +31,6 @@
 package com.google.api.gax.tracing;
 
 import com.google.api.client.util.Strings;
-import com.google.api.core.BetaApi;
-import com.google.api.core.InternalApi;
 import com.google.api.gax.rpc.LibraryMetadata;
 import com.google.common.annotations.VisibleForTesting;
 import io.opentelemetry.api.OpenTelemetry;
@@ -46,8 +44,6 @@
  *
  * <p>This class is expected to be initialized once during client initialization.
  */
-@BetaApi
-@InternalApi
 public class OpenTelemetryTracingFactory implements ApiTracerFactory {
   private final Tracer tracer;
   private final OpenTelemetry openTelemetry;

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryTracingTracer.java

@@ -31,7 +31,6 @@
 package com.google.api.gax.tracing;
 
 import com.google.api.client.util.Strings;
-import com.google.api.core.BetaApi;
 import com.google.api.core.InternalApi;
 import io.opentelemetry.api.trace.Span;
 import io.opentelemetry.api.trace.SpanBuilder;
@@ -42,8 +41,6 @@
 import java.util.concurrent.CancellationException;
 
 /** An implementation of {@link ApiTracer} that uses OpenTelemetry to record traces. */
-@BetaApi
-@InternalApi
 class OpenTelemetryTracingTracer implements ApiTracer {
 
   static final String CONTENT_LENGTH_KEY = "Content-Length";