Add a method to reject a TCP connection

[ThadHouse]

Description

Currently, it is impossible to reject a TCP connection. Calling CxPlatSocketDelete() from the Accept callback results in a use after free, and there isn't any way to detect that, other then to return a value from Accept()

Testing

New test added to cover this case.

Documentation

No, there is no documentation for TCP.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.91%. Comparing base (9f2f0d4) to head (9aaec8c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4536      +/-   ##
==========================================
- Coverage   86.19%   85.91%   -0.29%     
==========================================
  Files          56       56              
  Lines       15520    15520              
==========================================
- Hits        13378    13334      -44     
- Misses       2142     2186      +44     

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