workload: inject stats for workload init tpcc --data-loader IMPORT

[rytaft]

We currently inject pre-calculated statistics for workload fixtures import tpcc, but we do not inject them for workload init tpcc --data-loader IMPORT. Injecting stats helps avoid suboptimal query plans immediately after IMPORT and before the first automatic stats run. Ideally these two approaches should be identical, so we should inject stats in workload init tpcc --data-loader IMPORT too.

Jira issue: CRDB-7140

[github-actions]

We have marked this issue as stale because it has been inactive for
18 months. If this issue is still relevant, removing the stale label
or adding a comment will keep it active. Otherwise, we'll close it in
10 days to keep the issue queue tidy. Thank you for your contribution
to CockroachDB!