cli: bump default worker pool to heavy

[arulajmani]

For the benefit of TestDebugCheckStore.

Closes #122328
Closes #126593

Epic: none

Release note: None

[cockroach-teamcity]

This change is 

[arulajmani]

Thanks!

bors r+

[craig]

Build succeeded:

• linux_amd64_build
• local_roachtest
• windows_build
• examples_orms
• lint
• acceptance
• macos_amd64_build
• linux_arm64_build
• linux_amd64_fips_build
• unit_tests
• docker_image_amd64
• local_roachtest_fips
• macos_arm64_build
• check_generated_code

[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 f012fe4 to blathers/backport-release-23.1-126690: 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.

---

error creating merge commit from f012fe4 to blathers/backport-release-23.2-126690: 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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