#1687 - Make ResilienceContextPool settable via DI

[cmeyertons]

Pull Request

The issue or feature being addressed

#1687

Details on the issue fix or feature implementation

Followed @martintmk suggestion to make ResilientContextPool settable via DI pipeline

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 lines are covered by tests ✅

Comparison is base (e869fe8) 84.63% compared to head (9f363a4) 84.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1693      +/-   ##
==========================================
+ Coverage   84.63%   84.65%   +0.02%     
==========================================
  Files         306      306              
  Lines        6819     6829      +10     
  Branches     1045     1046       +1     
==========================================
+ Hits         5771     5781      +10     
  Misses        839      839              
  Partials      209      209              

Flag	Coverage Δ
linux	84.65% <100.00%> (+0.02%)	⬆️
macos	84.65% <100.00%> (+0.02%)	⬆️
windows	84.65% <100.00%> (?)

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

Files	Coverage Δ
....Core/Registry/RegistryPipelineComponentBuilder.cs	100.00% <100.00%> (ø)
...ore/Registry/ResiliencePipelineRegistry.TResult.cs	100.00% <100.00%> (ø)
.../Polly.Core/Registry/ResiliencePipelineRegistry.cs	100.00% <100.00%> (ø)
src/Polly.Core/ResiliencePipeline.cs	100.00% <100.00%> (ø)
...rc/Polly.Core/ResiliencePipelineBuilder.TResult.cs	100.00% <100.00%> (ø)
src/Polly.Core/ResiliencePipelineBuilder.cs	100.00% <100.00%> (ø)
src/Polly.Core/ResiliencePipelineBuilderBase.cs	100.00% <100.00%> (ø)
src/Polly.Core/ResiliencePipelineT.cs	100.00% <100.00%> (ø)

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[martincostello]

Seems reasonable to me, but I'll leave the other Martin to give a 👍 or 👎

[cmeyertons]

@martincostello @martintmk changes should be good to go from my end -- rebased off main and undid the var extraneous changes.