Fix unstable tests

[martintmk]

Details on the issue fix or feature implementation

With the introduction of ResilienceContext pooling (#1111) the "NotInitialized" assertion in ResilienceStrategyTests is no longer reliable because other tests might get the context from the pool and initialize it. This causes test instability.

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-commenter]

Codecov Report

Merging #1115 (c8b9480) into main (e891364) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main    #1115   +/-   ##
=======================================
  Coverage   77.78%   77.78%           
=======================================
  Files         200      200           
  Lines        4766     4766           
  Branches      851      851           
=======================================
  Hits         3707     3707           
  Misses        854      854           
  Partials      205      205           

Flag	Coverage Δ
linux	?
macos	77.78% <ø> (ø)
windows	?

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