[GreenDonut] Removed libraries available as part of framework from the reference list.

[thompson-tomo]

Summary of the changes

• Removed conditions for net standard 2.1 as not a TFM
• Removed System.Threading.Tasks.Extensions & System.Diagnostics.DiagnosticSource from dependendencies when TFM is not net standard 2.0 due to being provided by Framework

Closes #6868

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d9b3a66) 70.60% compared to head (ebaca1e) 70.58%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6879      +/-   ##
==========================================
- Coverage   70.60%   70.58%   -0.02%     
==========================================
  Files        2583     2583              
  Lines      128478   128478              
==========================================
- Hits        90707    90690      -17     
- Misses      37771    37788      +17     

Flag	Coverage Δ
unittests	70.58% <ø> (-0.02%)	⬇️

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[michaelstaib]

Hey @thompson-tomo,

thanks for your work on this. Do you want to move on to Hot Chocolate and do the same there?

[thompson-tomo]

@michaelstaib Sure thing, can u re-open the existing issue or do you want me to create a new one or simply link to the closed one?

[michaelstaib]

Hey @thompson-tomo,

as these are maintenance tasks a PR is enough.

[thompson-tomo]

Pr all submitted for Hot Chocolate.