[HotChocolate] Removed libraries available as part of framework from the reference list.

[thompson-tomo]

Summary of the changes

Have gone and done a cleanup of dependencies so that if the framework can provide them it does rather than an explicit dependency

Details of change

• Removed the below dependencies from projects targeting NET6.0+ and have the ASPNET framework reference
  • Microsoft.Extensions.Configuration.Abstractions
  • Microsoft.Extensions.Http
• Removed the below dependencies from projects targeting NET6.0+ and have the ASPNET framework reference
  • System.Collections.Immutable
  • System.ComponentModel.Annotations
  • System.Diagnostics.DiagnosticSource
  • System.Text.Json
  • System.Threading.Channels
• Removed item group conditions which reference netstandard2.1 when it wasn't a TFM

Closes #6869

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.51%. Comparing base (686f705) to head (8a3542a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6881      +/-   ##
==========================================
- Coverage   73.15%   70.51%   -2.64%     
==========================================
  Files        2596     2596              
  Lines      128977   128977              
==========================================
- Hits        94357    90953    -3404     
- Misses      34620    38024    +3404     

Flag	Coverage Δ
unittests	70.51% <ø> (-2.64%)	:arrow_down:

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[michaelstaib]

Just tested it ... thanks for your contribution.

[thompson-tomo]

No worries.