Improve coverage

[martincostello]

• Add missing coverage identified by Remove ignore-mutations:block #2524 and Remove ignore-mutations:statement #2525.
• Avoid allocating empty delegates.
• Fix-up some formatting.
• Remove redundant code.

[codecov]

Codecov Report

Attention: Patch coverage is 97.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.23%. Comparing base (4083d90) to head (5b47c88).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...cuitBreaker/AdvancedCircuitBreakerTResultSyntax.cs	85.71%	1 Missing ⚠️
...reaker/AsyncAdvancedCircuitBreakerTResultSyntax.cs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2526      +/-   ##
==========================================
+ Coverage   94.22%   96.23%   +2.00%     
==========================================
  Files         311      311              
  Lines        7413     7327      -86     
  Branches     1038     1013      -25     
==========================================
+ Hits         6985     7051      +66     
+ Misses        335      222     -113     
+ Partials       93       54      -39     

Flag	Coverage Δ
linux	96.23% <97.77%> (+2.00%)	⬆️
macos	96.23% <97.77%> (+2.00%)	⬆️
windows	96.22% <97.72%> (+2.01%)	⬆️

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