Remove `-XepOpt:ReturnValueIgnored:ObjectMethods=false`
Remove `-XepOpt:ReturnValueIgnored:ObjectMethods=false`

https://github.com/bazelbuild/bazel/issues/14589

RELNOTES[INC]: Error Prone now checks for unused return values of additional methods on `java.lang.Object`, which can be disabled using `--javacopts=-Xep:ReturnValueIgnored:OFF`

PiperOrigin-RevId: 422568615
Change-Id: Ie3866bb54c6b8bd73be885c9821bfcaab22d9659

bazelbuild/rules_java