[release/2.3] Don't send client CONNECTION_CLOSE on 1-RTT before handshake completion. (#4145)

[rzikm]

Ports #4145 to release/2.3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.74%. Comparing base (cb79889) to head (41bd50a).

Additional details and impacted files

@@               Coverage Diff               @@
##           release/2.3    #4164      +/-   ##
===============================================
- Coverage        87.35%   86.74%   -0.61%     
===============================================
  Files               56       56              
  Lines            16984    16987       +3     
===============================================
- Hits             14837    14736     -101     
- Misses            2147     2251     +104     

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[rzikm]

We should probably hold on this before merging, the fix I did may not be enough in some cases (see dotnet/runtime#99074)

[rzikm]

False alarm, we hit a slightly different bug: #4166 which can be fixed separately.