Turn off var preferences

[cmeyertons]

Pull Request

The issue or feature being addressed

Contributors leverage code cleanup add superfluous changes to files when executing code clean up due to var preferences

Link to PR & comment: #1693 (comment)

Details on the issue fix or feature implementation

Running code cleanup on Polly.Core results for the following editorconfig scenarios results in:

1. no changes: 15 files
2. toggle built-in to false: 16 files
3. turn off suggestions / cleanup for this rule: 6 files (cleaning up unnecessary usings)

After looking through the changes for options 1 & 2, it appears we are intentionally adding explicit context that is valuable in scenarios on both sides. This PR implements option 3 as the codebase does a pretty good job of being consistent while allowing for a few one-off exceptions in places where context is important.

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 (16d5fa1) 84.63% compared to head (dbb6a20) 84.63%.
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1700   +/-   ##
=======================================
  Coverage   84.63%   84.63%           
=======================================
  Files         306      306           
  Lines        6819     6819           
  Branches     1045     1045           
=======================================
  Hits         5771     5771           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	84.63% <ø> (?)
macos	84.63% <ø> (ø)
windows	84.63% <ø> (ø)

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

Files	Coverage Δ
...rc/Polly.Core/Hedging/HedgingResilienceStrategy.cs	100.00% <ø> (ø)
.../Polly.Core/Registry/ResiliencePipelineRegistry.cs	100.00% <ø> (ø)
src/Polly.Core/Retry/RetryHelper.cs	100.00% <ø> (ø)
src/Polly.Core/Utils/Pipeline/ExternalComponent.cs	100.00% <ø> (ø)
...ly.Core/Utils/Pipeline/PipelineComponentFactory.cs	100.00% <ø> (ø)

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