release-24.3: roachtest: link on large pool

[rickystewart]

Backport 1/1 commits from #157927 on behalf of @rickystewart.

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Release note: none
Epic: none

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Release justification: Non-production code changes

[blathers-crl]

Thanks for opening a backport.

Before merging, please confirm that it falls into one of the following categories (select one):

• Non-production code changes. Includes test-only changes, build system changes, etc.
• Fixes for serious issues. Defined in the policy as correctness, stability, or security issues, data corruption/loss, significant performance regressions, breaking working and widely used functionality, or an inability to detect and debug production issues.
• Other approved changes. These changes must be gated behind a disabled-by-default feature flag unless there is a strong justification not to.

Add a brief release justification to the PR description explaining your selection.

Also, confirm that the change does not break backward compatibility and complies with all aspects of the backport policy.

All backports must be reviewed by the TL and EM for the owning area.

[blathers-crl]

✅ PR #157934 is compliant with backport policy

Confidence: high
Backward compatible: true
Explanation: The PR is for a change in the non-production file path 'pkg/cmd/roachtest/BUILD.bazel', which is categorized under development tools. According to the policy criteria, changes that only affect non-production code, such as tests or development tools, are exempt from the standard backport requirements. The change in question adds an 'exec_properties' attribute to modify execution pool settings in a build configuration file and does not affect production code. The PR also includes a 'Release justification: Non-production code changes' indicating it has been reviewed for compliance.

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is