Remove CommunityToolkit.Diagnostics

[viceroypenguin]

This PR removes CommunityToolkit.Diagnostics package from the SuperLinq libraries. net8 bcl includes new methods that replicate most of the core functionality SuperLinq relies on; this functionality is conditionally added to SuperLinq directly in net7-, etc.

[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (79347f3) 92.88% compared to head (3916096) 93.00%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...ce/SuperLinq/Collections/UpdatablePriorityQueue.cs	50.00%	6 Missing ⚠️
Source/SuperLinq.Async/Memoize.cs	50.00%	4 Missing ⚠️
Source/SuperLinq/Memoize.cs	75.00%	4 Missing ⚠️
Source/SuperLinq.Async/Publish.cs	57.14%	3 Missing ⚠️
Source/SuperLinq.Async/Share.cs	57.14%	3 Missing ⚠️
...nerator/SuperLinq.Generator.Generator/EquiZip.g.cs	90.90%	0 Missing and 3 partials ⚠️
Source/SuperLinq.Async/AssertCount.cs	66.66%	0 Missing and 1 partial ⚠️
Source/SuperLinq.Async/Join.MergeJoin.cs	0.00%	1 Missing ⚠️
Source/SuperLinq.Async/Random.cs	87.50%	1 Missing ⚠️
Source/SuperLinq/Join.MergeJoin.cs	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #567      +/-   ##
==========================================
+ Coverage   92.88%   93.00%   +0.12%     
==========================================
  Files         255      255              
  Lines        8080     8133      +53     
  Branches     1621     1619       -2     
==========================================
+ Hits         7505     7564      +59     
+ Misses        364      359       -5     
+ Partials      211      210       -1     

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