workload/schemachange: turn on exec logging for all statements

[rafiss]

workload: log full stack trace of error on failure

workload/schemachange: make ErrorState implement Cause()

This will make the error formatting work more conventionally.

workload/schemachange: turn on exec logging

This will help us see exactly which statements were executed by the
workload, including helper queries.

Epic: None
Release note: None

[cockroach-teamcity]

This change is 

[fqazi]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @csgourav and @shailendra-patel)

[rafiss]

bors r+

[craig]

Build succeeded:

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

[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 9a2e427 to blathers/backport-release-23.2-137774: 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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