[#4821] Fixed email digest for BRK and addressNL component

[vaszig]

Closes #4821

Changes

• We want the email digest to report problems (broken configuration) for the addressNL component only when a valid BRK service and the validator are defined/configured.

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

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• 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 (738be59) to head (28702dd).
Report is 20 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4952   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files         760      760           
  Lines       25817    25825    +8     
  Branches     3382     3384    +2     
=======================================
+ Hits        24944    24952    +8     
  Misses        608      608           
  Partials      265      265           

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[sergei-maertens]

Let's backport this too 🤔

[vaszig]

Backports:

• stable/2.8.x: ed1191a
• stable/2.7.x: 7ad3588