chore: revert Microsoft.AspNetCore.SignalR.Client to 8.0.0

[philasmar]

Description of changes:

• Revert Microsoft.AspNetCore.SignalR.Client to 8.0.0 down from 8.0.15 to maintain support for older Visual Studio versions. Visual Studio 17.13 and older support up to 8.0.0.
• Update coverlet.collector to the latest version since the one we are using has a vulnerability.
• Remove Microsoft.VisualStudio.Azure.Containers.Tools.Targets from Test Apps since it is not used and it has a vulnerability.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.15%. Comparing base (e345568) to head (24a415f).
⚠️ Report is 41 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #977      +/-   ##
==========================================
- Coverage   63.59%   62.15%   -1.44%     
==========================================
  Files         284      294      +10     
  Lines       11040    10813     -227     
  Branches     1537     1615      +78     
==========================================
- Hits         7021     6721     -300     
- Misses       3467     3491      +24     
- Partials      552      601      +49     

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