Prepare release 2.7.10

[vaszig]

Closes #4843 partly

Changes

• [x] Update Changelog
• [x] Bump version
• [ ] Pin SDK version

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [x] Checked copying a form
  • [x] Checked import/export of a form
  • [x] Config checks in the configuration overview admin page
  • [x] Problem detection in the admin email digest is handled

• Release management

  • [x] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [x] Commit messages refer to the relevant Github issue
  • [x] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.52%. Comparing base (8300ec0) to head (3daae28).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## stable/2.7.x #4844 +/- ## ================================================ + Coverage 96.51% 96.52% +0.01% ================================================ Files 719 719 Lines 24219 24219 Branches 2889 2889 ================================================ + Hits 23374 23378 +4 + Misses 579 576 -3 + Partials 266 265 -1 ```

:umbrella: View full report in Codecov by Sentry.
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