Cleanup OutcomeResilienceStrategy

[martintmk]

Details on the issue fix or feature implementation

Just simplifying the implementation and cleaning some code.

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

[martintmk]

@vany0114 You are using this class in Simmy too. This should simplify your scenarios as well.

[codecov]

Codecov Report

Merging #1430 (367411d) into main (0cebeea) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1430   +/-   ##
=======================================
  Coverage   83.92%   83.93%           
=======================================
  Files         275      276    +1     
  Lines        6526     6528    +2     
  Branches     1007     1005    -2     
=======================================
+ Hits         5477     5479    +2     
  Misses        840      840           
  Partials      209      209           

Flag	Coverage Δ
linux	83.93% <100.00%> (+<0.01%)	⬆️
macos	83.93% <100.00%> (+<0.01%)	⬆️
windows	83.93% <100.00%> (?)

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

Files Changed	Coverage Δ
src/Polly.Core/Retry/RetryResilienceStrategy.cs	100.00% <ø> (ø)
.../Retry/RetryResilienceStrategyBuilderExtensions.cs	100.00% <ø> (ø)
...CircuitBreaker/CircuitBreakerResilienceStrategy.cs	100.00% <100.00%> (ø)
...rcuitBreakerResilienceStrategyBuilderExtensions.cs	100.00% <100.00%> (ø)
.../Polly.Core/Fallback/FallbackResilienceStrategy.cs	100.00% <100.00%> (ø)
...ack/FallbackResilienceStrategyBuilderExtensions.cs	100.00% <100.00%> (ø)
...rc/Polly.Core/Hedging/HedgingResilienceStrategy.cs	100.00% <100.00%> (ø)
...ging/HedgingResilienceStrategyBuilderExtensions.cs	100.00% <100.00%> (ø)
src/Polly.Core/Utils/OutcomeResilienceStrategy.cs	100.00% <100.00%> (ø)
src/Polly.Core/Utils/TaskHelper.cs	100.00% <100.00%> (ø)