Got rid of some warnings in the Polly project

[IgorIgorevich94]

The issue or feature being addressed

Contributes to #1290

Details on the issue fix or feature implementation

Got rid of SA1129; SA1204; S3928; CA1508; CA1822; CA2201; SA1642 warnings in the Polly project

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

[IgorIgorevich94]

@dotnet-policy-service agree

[codecov]

Codecov Report

Merging #1514 (2c49df8) into main (525d135) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 86.11%.

@@           Coverage Diff           @@
##             main    #1514   +/-   ##
=======================================
  Coverage   84.10%   84.10%           
=======================================
  Files         277      277           
  Lines        6581     6581           
  Branches     1025     1025           
=======================================
  Hits         5535     5535           
  Misses        837      837           
  Partials      209      209           

Flag	Coverage Δ
linux	84.10% <86.11%> (?)
macos	?
windows	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/Polly/CircuitBreaker/CircuitStateController.cs	93.93% <ø> (ø)
.../Polly/RateLimit/LockFreeTokenBucketRateLimiter.cs	82.75% <ø> (ø)
src/Polly/Registry/PolicyRegistry.cs	89.18% <0.00%> (ø)
src/Polly/AsyncPolicy.ContextAndKeys.cs	83.33% <50.00%> (ø)
src/Polly/Policy.ContextAndKeys.cs	83.33% <50.00%> (ø)
src/Polly/AsyncPolicy.ExecuteOverloads.cs	72.72% <100.00%> (ø)
src/Polly/AsyncPolicy.TResult.ExecuteOverloads.cs	75.86% <100.00%> (ø)
src/Polly/Policy.ExecuteOverloads.cs	86.36% <100.00%> (ø)
src/Polly/Policy.TResult.ExecuteOverloads.cs	87.50% <100.00%> (ø)
src/Polly/PolicyBase.ContextAndKeys.cs	100.00% <100.00%> (ø)
... and 3 more

[martintmk]

@martincostello Is this OK to be merged?