Remove try-except around verifying the migration progress prerequisites in the migrate-tables cli command (#3439)

## Changes
Remove `try-except` around verifying the migration progress prerequistes
in the `migrate-tables` cli command as the warning is more specific
inside the class

### Linked issues

Progresses #3438

### Functionality

- [x] modified existing command: `databricks labs ucx migrate-tables`

---------

Co-authored-by: Guenia Izquierdo Delgado <[email protected]>

Author: JCZuurmond

src/databricks/labs/ucx/cli.py

@@ -687,16 +687,7 @@ def migrate_tables(
     for workspace_context in workspace_contexts:
         deployed_workflows = workspace_context.deployed_workflows
 
-        try:
-            workspace_context.verify_progress_tracking.verify()
-        except RuntimeWarning:
-            logger.warning(
-                "We couldn't detect a successful run of the assessment workflow."
-                "The assessment workflow is a prerequisite for the migrate-tables workflow."
-                "It can be run by using the `ensure-assessment-run` command."
-            )
-            return
-
+        workspace_context.verify_progress_tracking.verify()
         deployed_workflows.run_workflow("migrate-tables")
 
         tables = list(workspace_context.tables_crawler.snapshot())

tests/unit/test_cli.py

@@ -1028,28 +1028,15 @@ def test_migrate_tables_calls_migrate_table_job_run_now(
         workspace_client.jobs.wait_get_run_job_terminated_or_skipped.assert_called_once()
 
 
-@pytest.mark.parametrize("run_as_collection", [False, True])
-def test_migrate_tables_errors_out_before_assessment(
-    run_as_collection,
-    workspace_clients,
-    acc_client,
-) -> None:
-    if not run_as_collection:
-        workspace_clients = [workspace_clients[0]]
-    run = Run(
-        state=RunState(result_state=RunResultState.SUCCESS),
-        start_time=0,
-        end_time=1000,
-        run_duration=1000,
-    )
-    for workspace_client in workspace_clients:
-        workspace_client.jobs.wait_get_run_job_terminated_or_skipped.return_value = run
-        workspace_client.jobs.list_runs.return_value = [Run(state=RunState(result_state=RunResultState.FAILED))]
+def test_migrate_tables_errors_out_before_assessment(ws, acc_client) -> None:
+    verify_progress_tracking = create_autospec(VerifyProgressTracking)
+    verify_progress_tracking.verify.side_effect = RuntimeWarning("Verification failed")
+    ctx = WorkspaceContext(ws).replace(verify_progress_tracking=verify_progress_tracking)
 
-    migrate_tables(workspace_clients[0], MockPrompts({}), run_as_collection=run_as_collection, a=acc_client)
+    with pytest.raises(RuntimeWarning, match="Verification failed"):
+        migrate_tables(ws, MockPrompts({}), ctx=ctx, a=acc_client)
 
-    for workspace_client in workspace_clients:
-        workspace_client.jobs.run_now.assert_not_called()
+    ws.jobs.run_now.assert_not_called()
 
 
 def test_migrate_tables_calls_external_hiveserde_tables_job_run_now(ws) -> None: