Fix warning CA1062#AsyncNoOpPolicy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/NoOp/AsyncNoOpPolicy.cs or fix the warning

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.91%. Comparing base (994193e) to head (e52e13d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2220   +/-   ##
=======================================
  Coverage   83.90%   83.91%           
=======================================
  Files         313      313           
  Lines        7183     7187    +4     
  Branches     1062     1064    +2     
=======================================
+ Hits         6027     6031    +4     
  Misses        785      785           
  Partials      371      371           

Flag	Coverage Δ
linux	83.91% <100.00%> (+<0.01%)	⬆️
macos	83.91% <100.00%> (+<0.01%)	⬆️
windows	?

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