Release 2.8.0-beta.0

[sergei-maertens]

Closes #4663

Changes

• Ensured that the ordering of objects API groups matches oldest PK to newest, because of the ZGW APIs plugin behaviour (pending UX rework)
• Update changelog
• Bumped version number
• Removed obsoleted upgrade constraints and check scripts

Checklist

Check off the items that are completed or not relevant.

• Impact on features

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

• Release management

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

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

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.61%. Comparing base (b147766) to head (2aa4812).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4674   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files         746      746           
  Lines       25144    25144           
  Branches     3302     3302           
=======================================
  Hits        24292    24292           
  Misses        589      589           
  Partials      263      263           

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[joeribekker]

Looks good, one remark.