:wastebasket: [#3283] Make FormDefinitionSerializer.name read only

[stevenbal]

Related to #3283

TODO:

• [ ] add changelog warning for imports

Changes

• Make FormDefinitionSerializer.name read only

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 96.57%. Comparing base (51f9713) to head (cae00db). Report is 53 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4829 +/- ## ======================================= Coverage 96.57% 96.57% ======================================= Files 748 748 Lines 25448 25448 Branches 3369 3369 ======================================= Hits 24576 24576 Misses 608 608 Partials 264 264 ```

:umbrella: View full report in Codecov by Sentry.
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