In particular this applies to Java and Python microgenerators.
With this change `java_gapic_*` and `py_gapic_*` rules mean microgenerator versions. The monolith versions of the rules are named as `java_gapic_*_legacy` and `py_gapic_*_legacy` respectively.
Also change Ads BAZEL template to reflect the change in default rule names.
Also change `DO NOT OVERRIDE` comment warnings meaning (to reflect that now by default microgenerator rules are generated and the generated version must be accepted only if the API is being migrated to the microgenerator).
PiperOrigin-RevId: 346227314
The nodejs_gapic_library targets were migrated to gapic-generator-typescript
which doesn't use gapic_yaml, rendering that attribute unused. Instead it uses
the proto annotations & grpc_service_config, which this change reflects.
PiperOrigin-RevId: 314206960
