🐛 [#4587] Copy Form.product when copying Form

[stevenbal]

Closes #4587

Changes

• Copy Form.product when copying Form

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 96.64%. Comparing base (6af8cc2) to head (80f3acf). Report is 35 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4666 +/- ## ========================================== - Coverage 96.68% 96.64% -0.04% ========================================== Files 737 746 +9 Lines 25063 25144 +81 Branches 3299 3302 +3 ========================================== + Hits 24232 24301 +69 - Misses 569 581 +12 Partials 262 262 ```

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