feat: throw exception when user attempt to override api-version header. #2745
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As discussed offline, amend behavior so that if user code attempt to override api-version header via user header, conflict resolution in ClientContext would throw exception. This is consistent whether service itself sets api-version in proto or not (or empty).
TODO: when #2737 gets in, add a test case to ITApiVersionHeaders.java where attempts
setHeaderProvider()
and exception throws.