[16.0][ADD] project_milestone_tree

[victor-champonnois]

Add the missing menu item to the project milestones.

[dreispt]

/ocabot merge nobump

[OCA-git-bot]

This PR looks fantastic, let's merge it!
Prepared branch 16.0-ocabot-merge-pr-1258-by-dreispt-bump-nobump, awaiting test results.

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[OCA-git-bot]

@dreispt your merge command was aborted due to failed check(s), which you can inspect on this commit of 16.0-ocabot-merge-pr-1258-by-dreispt-bump-nobump.

After fixing the problem, you can re-issue a merge command. Please refrain from merging manually as it will most probably make the target branch red.

[OCA-git-bot]

@dreispt your merge command was aborted due to failed check(s), which you can inspect on this commit of 16.0-ocabot-merge-pr-1258-by-dreispt-bump-nobump.

After fixing the problem, you can re-issue a merge command. Please refrain from merging manually as it will most probably make the target branch red.

[leemannd]

/ocabot merge nobump

[OCA-git-bot]

On my way to merge this fine PR!
Prepared branch 16.0-ocabot-merge-pr-1258-by-leemannd-bump-nobump, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at 5ece8b5. Thanks a lot for contributing to OCA. ❤️