Migrate GlobalInterceptors to ConfiguratorRegistry (1.64.x backport) #11180
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This should preserve all the existing behavior of GlobalInterceptors as used by grpc-gcp-observability, including it disabling the implicit OpenCensus integration.
Both the old and new API are internal. I hid Configurator and ConfiguratorRegistry behind Internal-prefixed classes, like had been done with GlobalInterceptors to further discourage use until the API is ready.
GlobalInterceptorsTest was modified to become ConfiguratorRegistryTest.
CC @DNVindhya, @temawi
Backport of #11148