bugfix: send html emails in legacy features

[lmoesle]

Description

Short description or comments

Reference

Issues: closes #1109

Check-List

• All Acceptance criteria of user story are met
• JUnit tests are written (60% CodeCov)
• Internal Review is maintained
• Documentations external and internal are completed
• Smoketest successful (Manual E2E-Test depending on Change)
• No Branch waste left
• Board is up-to-date
• Openshift environments are prepared (Secrets, etc.) and release-issue is maintained

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d7bce5f) 37.70% compared to head (a4ae96d) 37.69%.

Files	Patch %	Lines
...gacy/mailing/process/SendMailTemplateDelegate.java	0.00%	1 Missing ⚠️
...ling/process/SendMailTemplateWithLinkDelegate.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #1111      +/-   ##
============================================
- Coverage     37.70%   37.69%   -0.01%     
  Complexity     1261     1261              
============================================
  Files           600      600              
  Lines          8696     8698       +2     
  Branches        422      422              
============================================
  Hits           3279     3279              
- Misses         5283     5285       +2     
  Partials        134      134              

Flag	Coverage Δ
unittests	37.69% <33.33%> (-0.01%)	⬇️

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[darenegade]

Passt