roachtest: add failover variants with expiration leases

[erikgrinaker]

Expiration-based leases have different availability properties than epoch leases under most failure modes. This patch adds failover test variants that use expiration-based leases only.

Epic: none
Release note: None

[cockroach-teamcity]

This change is 

[andrewbaptist]

It looks like the name will be unchanged for non-expiration leases which is excellent!

Have you run all these tests already? Do they all pass with better results than non-expiration? I'm not sure it makes much sense to backport this "soon" as we should ensure no flakiness associated with these tests by letting them bake for a couple of weeks on master.

[erikgrinaker]

TFTR! Haven't run them yet, will let the nightlies do it. I agree with letting it bake for a bit, but will open the backports now.

bors r+

[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 8cafeae to blathers/backport-release-23.1-102916: 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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