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#resolves 22651
This PR reverts the removal commit for the Mill plugin due to problem when releasing 7.19.0, and provides a fix for the particular issue.
Javadoc is now properly generated.

Summary by cubic
Restores the Mill plugin and fixes Javadoc/Scaladoc generation that broke in 7.19.0, addressing Linear 22651. Adds a production-ready Mill OpenApiModule with examples, tests, CI, and docs.
New Features
Bug Fixes
Written for commit 85d1111. Summary will update on new commits.