inspect: speed up tests via faster job adoption

[yuzefovich]

I noticed that inspect tests were quite slow, so I added jobs.NewTestingKnobsWithShortIntervals() to all that start a server or a cluster, which significantly sped up things (from multiple minutes to under a minute when run sequentially).

Epic: None
Release note: None

[cockroach-teamcity]

This change is 

[spilchen]

Thanks for fixing this!

@spilchen reviewed 4 files and all commit messages, and made 1 comment.
Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @bghal).

[yuzefovich]

TFTR!

bors r+

[craig]

Build succeeded:

• local_roachtest
• acceptance
• linux_amd64_build
• docker_image_amd64
• local_roachtest_fips
• linux_amd64_fips_build
• unit_tests
• check_generated_code
• lint
• examples_orms

[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 9987165 to blathers/backport-release-25.4-160588: POST https://api.github.com/repos/yuzefovich/cockroach/merges: 409 Merge conflict []

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

Backport to branch 25.4.x failed. See errors above.

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