Use protobuf for all release configs

- Default to using protobuf
  - trunk_staging already refuses starlark: must use protobuf
- Release configs declared elsewhere will use protobuf unless they:
  - override RELEASE_BUILD_FLAGS_IN_PROTOBUF, and/or
  - lack support for release configs in protobuf.

Bug: 328495189
Test: manual, TH
Merged-In: I7e960badcde1e288bec85195b5107024a0111fa1
Change-Id: I348cc25a01894da9d4800c1cdc6e3bb2d4212197
2 files changed