[ObjC] Breaking Change: Remove support for older generated code. #18736
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[ObjC] Breaking Change: Remove support for older generated code.
Remove runtime methods that support the Objective-C gencode from before the 3.22.x release.
COPYBARA_INTEGRATE_REVIEW=#17882 from dotnwat:patch-1 348ce1b
FUTURE_COPYBARA_INTEGRATE_REVIEW=#17882 from dotnwat:patch-1 348ce1b