chore: prepare release validation script

[Antreesy]

☑️ Resolves

• Automate Preparation step from [Template] 🚀 Release todo X.Y.Z #5879

Tip

make validate-release for preview of all maintaned branches
make validate-release BRANCHES='stable34 stable35' for preview of selected branches
make prepare-changelog to prepare a changelog branch with pre-fabricated commits to adjust and push
make prepare-changelog BRANCHES='stable34 stable35' to prepare a changelog for selected branches
make bump-version PR='19000' to modify appinfo/info.xml and package.json according to new version in given PR backport
make bump-version PR='backport/0000/stable35' to modify appinfo/info.xml and package.json according to new version in given branch
make update-milestones BRANCH='stable35' to show how milestones would be updated and provide commands

Note

make prepare-changelog just gather information since last tag and commit it in bulk. Changelog should be rewritten/adjusted manually to only include relevant changes
Public API is rate-limited to 60 requests/hour. You can optionally pass own token as env variable to overcome this: make ... GH_TOKEN=$(gh auth token)

Screenshots:

make validate-release

make prepare-changelog BRANCHES='stable34 stable35'

output	diff

on RC	on stable
make bump-version PR='backport/0000/stable35'	make bump-version PR='backport/0000/stable34'

make update-milestones PR='stable34'

AI (if applicable)

• The content of this PR was partly or fully generated using AI