feat(docs): publish protobuf to refdocs

[bshaffer]

fixes #9118

TODO

• Try to fix the broken references in Google\Protobuf\Any instead of hiding them
  • Fixed by checking out the RC release of protobuf v5.35.0, the broken references are fixed in that version.
• [BLOCKED] Remove the minimum-stability and raise the minimum version to v5.35.0 once is released.

Generating documentation for protobuf
Running phpdoc to generate structure.xml... Done.
Writing output to protobuf-out... Broken xref in \Google\Protobuf\Any: empty
Broken xref in \Google\Protobuf\Any::getTypeUrl(): empty
Broken xref in \Google\Protobuf\Any::setTypeUrl(): empty

[bshaffer]

Tests are failing because Protobuf 5.x requires PHP 8.2 and we are running our docs pipeline on PHP 8.1. We will need to update the containers on our backend which deploy our documentation before we can make this change