chore: rename the branch to feature/v2; remove the E2E GHA

[csuzhangxc]

What problem does this PR solve?

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.69%. Comparing base (5c8cd6a) to head (e681111).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature/v2    #5984   +/-   ##
===========================================
  Coverage       19.69%   19.69%           
===========================================
  Files             151      151           
  Lines           10461    10461           
===========================================
  Hits             2060     2060           
  Misses           8189     8189           
  Partials          212      212           

Flag	Coverage Δ
unittest	19.69% <ø> (ø)