jepsen: potential deadlock during worker setup

[srosenberg]

See [1] for the description of the failure mode. We need to backport the fix in [1] to tc-nightly-main.

[1] #151712 (comment)
[2] cockroachdb/jepsen@dfd82f4

Jira issue: CRDB-53666

[blathers-crl]

Hi @srosenberg, please add branch-* labels to identify which branch(es) this C-bug affects.

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

[blathers-crl]

cc @cockroachdb/test-eng