FEATURE: Workspace UI - Add second confirmation window for rebasing

[pKallert]

As discussed in #5450 the "force rebase" journey is a little bit too harmless for dropping changes.

We discussed restricting the force rebase to editors but that was also not ideal since perhaps editors should not have to have admin permissions.

Changes in this PR:

1. The popup looks more dangerous
2. The conflicting changes are shown (just basic parsing, no details)
3. A confirmation popup is shown

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mhsdesign]

Thank you so much that was faaaaaast :D

And i think i found a solution for the (too technical) json blob:

you only see it when you fold it:

ill push my patch as well ok?