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