[repo] dotnet format ci follow-up

[CodeBlanch]

Follow-up to #4881

Changes

• Run the dotnet format job in stable & experimental modes

Merge requirement checklist

• CONTRIBUTING guidelines followed (nullable enabled, static analysis, etc.)

[CodeBlanch]

@sharwell

Seems we are getting a lot of odd errors from dotnet format using .NET 8 RC2: https://github.com/open-telemetry/opentelemetry-dotnet/actions/runs/6725194812/job/18279064981?pr=5012#step:5:9

I tried to get it working locally but I can't seem to figure it out. Is this a known thing?

[codecov]

Codecov Report

Merging #5012 (f9ae5f4) into main (ba161c4) will decrease coverage by 0.12%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5012      +/-   ##
==========================================
- Coverage   83.51%   83.40%   -0.12%     
==========================================
  Files         296      296              
  Lines       12377    12377              
==========================================
- Hits        10337    10323      -14     
- Misses       2040     2054      +14     

Flag	Coverage Δ
unittests	83.40% <ø> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...endencyInjectionLoggerProviderBuilderExtensions.cs	100.00% <ø> (ø)
...encyInjectionLoggingServiceCollectionExtensions.cs	100.00% <ø> (ø)

... and 5 files with indirect coverage changes