ci: New linter actions

[johannesvedder]

• .github/workflows/all_packages.yml now commits any changes to melos format / generate / fix directly without failing
• Removed .github/workflows/check-uncomitted-changes.yml since its task is now included in all_packages.yml workflow
• Introduced new .github/workflows/linter.yml workflow that appends newlines to files for POSIX compliance and directly commits any changes
  • Workaround with token applied, so that github action commits can trigger other actions https://github.com/orgs/community/discussions/25702
• Small other action related changes

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit a1f56ee):

• https://studyu-dev-app--pr663-ci-linter-actions-jym816oh.web.app
• https://studyu-dev-designer--pr663-ci-linter-actions-9v3tm9zb.web.app

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