.NET 8 preparation

[martincostello]

• Cherry-pick various changes from Update to .NET 8 #1162.
• Adopt NuGet central package version management.

[codecov]

Codecov Report

Merging #1173 (5d8c781) into main (f46f2b8) will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1173      +/-   ##
==========================================
- Coverage   86.06%   85.81%   -0.25%     
==========================================
  Files         134      134              
  Lines        3257     3257              
==========================================
- Hits         2803     2795       -8     
- Misses        454      462       +8     

Flag	Coverage Δ
linux	85.53% <ø> (-0.28%)	⬇️
macos	53.85% <ø> (ø)
windows	53.85% <ø> (+0.28%)	⬆️

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see 3 files with indirect coverage changes

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