KAFKA-12886: Enable request forwarding by default

[ex172000]

Making forwarding enabled by default

Committer Checklist (excluded from commit message)

• [x] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [x] Verify documentation (including upgrade notes)

[divijvaidya]

Note that this PR in it's current form leads to a large number of test failures. Please ensure that we fix the tests before marking it ready for review.

[ex172000]

Note that this PR in it's current form leads to a large number of test failures. Please ensure that we fix the tests before marking it ready for review.

Thank you Divij for the reminder. Is it possible these tests are flaky? I tried to execute many times locally on this feature branch but none of the CI-failed tests failed locally.

[github-actions[bot]]

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