Bug/4810 changing textcase on form variable update

[robinmolen]

Closes #4810

Changes

The JSON parser on the form variables endpoint now ignores the initial_value field. This ensures that the form variable initial value, and the default value of the component, stay exactly the same.

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 96.58%. Comparing base (796bb43) to head (a2c84db). Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4837 +/- ## ======================================= Coverage 96.58% 96.58% ======================================= Files 748 748 Lines 25476 25477 +1 Branches 3368 3368 ======================================= + Hits 24605 24607 +2 Misses 608 608 + Partials 263 262 -1 ```

:umbrella: View full report in Codecov by Sentry.
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[vaszig]

Backports:

• stable 2.8.x: ceb3dad33741b38a269faf991009f8ea362bb28d
• stable 2.7.x: be2514ad30f414f24f7e64ba0d5f8070c8af9b97