[#6624] Update EmailVerification model regarding the help texts

[vaszig]

Closes #6624

Changes

• Update the help texts regarding the new need to have email verification in Profile component too.

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
  • Checked new model fields are usable in the admin
  • Problem detection in the admin email digest is handled

• 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

• Documentation

  • Added documentation which describes the changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (0455df6) to head (46d5420).
⚠️ Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6633   +/-   ##
=======================================
  Coverage   97.25%   97.26%           
=======================================
  Files         859      859           
  Lines       33245    33312   +67     
  Branches     2995     3004    +9     
=======================================
+ Hits        32333    32400   +67     
  Misses        603      603           
  Partials      309      309           

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