roachtest: acceptance/multitenant uses virtual cluster roachprod API

[renatolabs]

This commit updates the acceptance/multitenant roachtest to use the recently introduced roachprod API to manage virtual clusters.

It also removes the previous log checking, as that logic is brittle. In addition, we no longer support creating virtual clusters by ID. The acceptance test just verifies that we are able to create a new virtual cluster, perform basic queries on it, and terminate it.

Fixes: #117671.

Release note: None

[cockroach-teamcity]

This change is 

[renatolabs]

TFTR!

bors r=srosenberg

[craig[bot]]

Build succeeded:

• Bazel Essential CI (Cockroach)

[blathers-crl[bot]]

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 5b8733c5ed31c8a9c6d56449e9b20d81fe3a61ac to blathers/backport-release-23.1-119598: 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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error creating merge commit from 5b8733c5ed31c8a9c6d56449e9b20d81fe3a61ac to blathers/backport-release-23.2-119598: 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 23.2.x failed. See errors above.

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