roachtest: avoid using sudo to install python packages

[rafiss]

see also #88675

sudo can make it confusing which veresion of a package is being installed and used. This fixes the usage of virtualenvs, and avoid sudo.

This also removes per-version blocklists for python tools' tests.

Release note: None

[cockroach-teamcity]

This change is 

[e-mbrown]

LGTM!

[rafiss]

tftr!

bors r=e-mbrown

[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 7849cc1 to blathers/backport-release-22.1-89851: 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 22.1.x failed. See errors above.

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error creating merge commit from 7849cc1 to blathers/backport-release-22.2-89851: 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 22.2.x failed. See errors above.

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