Fix CA2000/stalled suppressions

[gintsk]

Pull Request

The issue or feature being addressed

Contributes to #1290

Details on the issue fix or feature implementation

Fix CA2000 in Polly.Specs tests
Removed stalled suppressions

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
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2d5e364) 85.90% compared to head (838ea61) 85.90%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1947   +/-   ##
=======================================
  Coverage   85.90%   85.90%           
=======================================
  Files         312      312           
  Lines        6647     6647           
  Branches     1057     1057           
=======================================
  Hits         5710     5710           
  Misses        540      540           
  Partials      397      397           

Flag	Coverage Δ
linux	85.90% <ø> (ø)
macos	85.90% <ø> (ø)
windows	85.90% <ø> (ø)

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