Removes a number of commit message scopes that are no longer in use.
- `bazel`: Now part of `dev-infra`
- `changelog`: The changelog is autogenerated and doesn't have dedicated commits.
- `packaging`: Is handled by `dev-infra` as well.
PR Close#64492
The contribution guide is updated to provide clearer instructions on when to use the `docs-infra` scope versus the `docs` type.
This change helps contributors understand that `docs-infra` should only be used for infrastructure-related changes (application code, tooling, configuration) within the `/adev` directory. For simple content modifications, such as editing a `.md` file, `docs` without a scope is the correct choice.
PR Close#63799
