Allow connect on Http2ProtocolOptions when Websockets are enabled

[rajatvig]

This should possibly address part of #3371 and possibly knative/serving#13083 when using Knative with Contour.

Signed-off-by: Rajat Vig [email protected]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.05%. Comparing base (6f6c0f4) to head (0da4d80).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6846   +/-   ##
=======================================
  Coverage   81.05%   81.05%           
=======================================
  Files         133      133           
  Lines       20026    20030    +4     
=======================================
+ Hits        16232    16236    +4     
  Misses       3500     3500           
  Partials      294      294           

Files with missing lines	Coverage Δ
internal/envoy/v3/listener.go	98.50% <100.00%> (+<0.01%)	⬆️

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