KAFKA-7040: Ignore OffsetsForLeaderEpoch response if leader epoch changed while request in flight

[apovzner]

This is a "backport" of #6101 + relevant parts of #5661 for 2.0 branch.

cc @hachikuji

Committer Checklist (excluded from commit message)

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

[ijuma]

Looks like there are conflicts. Are we still trying to merge this to 2.0?

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