Allow reusing CircuitBreakerManualControl across multiple CBs

[martintmk]

Details on the issue fix or feature implementation

I don't see any reason why this shouldn't be allowed.

Additionally, don't throw unnecessary. The user can isolate the manual control even before and the CB will be isolated once it's attached.

Contributes to #1365

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

Merging #1375 (6b5ff97) into main (70129e2) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1375      +/-   ##
==========================================
- Coverage   83.61%   83.60%   -0.02%     
==========================================
  Files         268      267       -1     
  Lines        6403     6397       -6     
  Branches     1004     1002       -2     
==========================================
- Hits         5354     5348       -6     
  Misses        840      840              
  Partials      209      209              

Flag	Coverage Δ
macos	83.60% <100.00%> (-0.02%)	⬇️
windows	83.60% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
...Core/CircuitBreaker/CircuitBreakerManualControl.cs	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes