tests: stop tests not supported by older versions from running

[systay]

Description

New tests have been added in main that we try to run against older versions of vtgate, and these tests fail.
This change will stop said tests from running on older versions of vtgate.

Related Issue(s)

Faulty tests added in: #12994

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on the CI
• Documentation was added or is not required

[vitess-bot]

Review Checklist

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