[3.3] Revert "Add connection preface process to TripleHttp2Protocol (#15368)"

[zrlw]

This reverts commit e396bde because the revised content hasn't been reviewed yet.

What is the purpose of the change?

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.90%. Comparing base (e396bde) to head (6152c53).
Report is 1 commits behind head on 3.3.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15435      +/-   ##
============================================
- Coverage     60.92%   60.90%   -0.02%     
+ Complexity    11436    11421      -15     
============================================
  Files          1889     1887       -2     
  Lines         86310    86266      -44     
  Branches      12935    12929       -6     
============================================
- Hits          52583    52543      -40     
- Misses        28283    28285       +2     
+ Partials       5444     5438       -6     

Flag	Coverage Δ
integration-tests-java17	33.07% <ø> (+0.02%)	⬆️
integration-tests-java8	33.13% <ø> (-0.03%)	⬇️
samples-tests-java17	31.42% <ø> (-0.03%)	⬇️
samples-tests-java8	29.24% <ø> (+<0.01%)	⬆️
unit-tests	58.85% <ø> (+<0.01%)	⬆️

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