See this PR desc for update #155397

Follow up to #147374
See this thread: #153269 (comment)

schemachange/mixed-versions uses a dedicated workload binary. This was previously not versioned.

Currently there's a limitation on this test

		// Disable version skipping and limit the test to only one upgrade as the workload is only
		// compatible with the branch it was built from and the major version before that.
		mixedversion.NumUpgrades(1),
		mixedversion.DisableSkipVersionUpgrades,

If workload binary is versioned, we should be able to remove this limitation.

Outcome of this is to verify the initial failure mode, then use a dedicated versioned workload binary and see if doing that remove's the current upgrade limitation for this test.

Test Failure (with versioned binary): https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/20520974?hideProblemsFromDependencies=false&hideTestsFromDependencies=false&expandBuildTestsSection=true&expandBuildChangesSection=true&expandBuildDeploymentsSection=false

Update: I think the initial failure I saw during my initial refactor was the same issue i'm seeing now where we can't find the specific binary on GCS.

Jira issue: CRDB-54845