Change test client subscription notification collection to queue

[Dragemil]

No description provided.

[github-actions]

Test Results

31 tests  ±0   31 ✔️ ±0   23s ⏱️ -1s
  3 suites ±0     0 💤 ±0 
  3 files   ±0     0 ❌ ±0 

Results for commit 3d0bb19. ± Comparison against base commit f73f98f.

[codecov]

Codecov Report

Merging #29 (3d0bb19) into main (f73f98f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   89.26%   89.26%           
=======================================
  Files          16       16           
  Lines         419      419           
=======================================
  Hits          374      374           
  Misses         45       45           

Files	Coverage Δ
...c/LeanCode.Pipe.TestClient/LeanPipeSubscription.cs	100.00% <100.00%> (ø)
...de.Pipe.TestClient/LeanPipeTestClientExtensions.cs	100.00% <ø> (ø)

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