Update Connection reference counting to use ref counting APIs

[anrossi]

Description

Update QUIC_CONNECTION RefCount to use CXPLAT_REF_COUNT and also update the detailed ref counts to use the CXPLAT_REF_COUNT type. Related to #5570

Testing

CI

Documentation

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.86%. Comparing base (6c0fd3a) to head (a617f1f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5584      +/-   ##
==========================================
- Coverage   85.62%   84.86%   -0.76%     
==========================================
  Files          60       60              
  Lines       18663    18663              
==========================================
- Hits        15980    15839     -141     
- Misses       2683     2824     +141     

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