Exempt methods annotated with @StartBundle or @FinishBundle since the…

…y are called reflectively by the Apache Beam framework.

https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.html

PiperOrigin-RevId: 601899898

core/src/main/java/com/google/errorprone/bugpatterns/UnusedMethod.java

@@ -139,7 +139,9 @@ public final class UnusedMethod extends BugChecker implements CompilationUnitTre
           "javax.validation.constraints.AssertTrue",
           "net.bytebuddy.asm.Advice.OnMethodEnter",
           "net.bytebuddy.asm.Advice.OnMethodExit",
+          "org.apache.beam.sdk.transforms.DoFn.FinishBundle",
           "org.apache.beam.sdk.transforms.DoFn.ProcessElement",
+          "org.apache.beam.sdk.transforms.DoFn.StartBundle",
           "org.aspectj.lang.annotation.Pointcut",
           "org.aspectj.lang.annotation.After",
           "org.aspectj.lang.annotation.Before",