logictest: disable metamorphic testing for mixed version test

[rafiss]

We've seen that these tests can get quite slow sometimes. One theory is that this is caused by metamorphic test settings, so this PR disables them so we can determine if it helps with test stability.

informs #112621
Release note: None

[cockroach-teamcity]

This change is 

[mgartner]

Nice!

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @dt, @RaduBerinde, @renatolabs, and @yuzefovich)

[yuzefovich]

No backport yet - you're thinking of letting this take effect on master for some time but backport later if necessary?

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 2 of 0 LGTMs obtained (waiting on @dt, @RaduBerinde, and @renatolabs)

[rafiss]

No backport yet - you're thinking of letting this take effect on master for some time but backport later if necessary?

i think this should be an uncontroversial backport. even if it doesn't help with the flakes, i don't see any reason why we want this test to be metamorphic.

tftr!

bors r+

[craig]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from 48eceb7 to blathers/backport-release-23.1-112624: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 23.1.x failed. See errors above.

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