KIP-891: Multiversioning in Kafka Connect - Config and Validation Tests

[snehashisp]

This adds tests for
KIP-891.
. This adds tests for connector config and validations with connector
versions. It has dependency on the actual KIP implementation PRs and
previous tests PRs and should be merged post
#17742 and
#18325

Committer Checklist (excluded from commit message)

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

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[snehashisp]

Hi @gharris1727, apologies for my absence with regards to these final two PRs. This one and the following #18360 should make the feature a lot more robust and prevent regressions in future. Can you please review this and the other one.

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[mimaison]

@snehashisp Can you rebase your PR to resolve the conflicts? Thanks

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