fix: suppress MustBeClosedChecker on OpenTelemetry inScope

Author: jinseopkim0

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

@@ -76,6 +76,9 @@ public Scope inScope() {
     if (attemptSpan == null) {
       return () -> {};
     }
+    // Suppressing to make MustBeClosedChecker happy. The scope will be closed indirectly
+    // via the returned ApiTracer.Scope, and the checker cannot recognize it.
+    @SuppressWarnings("MustBeClosedChecker")
     io.opentelemetry.context.Scope otelScope = attemptSpan.makeCurrent();
     return otelScope::close;
   }