Skip test_table_migration_job integration test for now (#1075)

Skip `test_table_migration_job` integration test for now to avoid
slowing down due to azure instance provisioning, until we add instance
pool to cluster policy.

## Changes
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Resolves #..

### Functionality 

- [ ] added relevant user documentation
- [ ] added new CLI command
- [ ] modified existing command: `databricks labs ucx ...`
- [ ] added a new workflow
- [ ] modified existing workflow: `...`
- [ ] added a new table
- [ ] modified existing table: `...`

### Tests
<!-- How is this tested? Please see the checklist below and also
describe any other relevant tests -->

- [ ] manually tested
- [ ] added unit tests
- [ ] added integration tests
- [ ] verified on staging environment (screenshot attached)

Author: qziyuan

tests/integration/test_installation.py

@@ -466,6 +466,7 @@ def test_check_inventory_database_exists(ws, new_installation):
     assert err.value.args[0] == f"Inventory database '{inventory_database}' already exists in another installation"
 
 
+@pytest.mark.skip
 @retried(on=[NotFound], timeout=timedelta(minutes=10))
 def test_table_migration_job(  # pylint: disable=too-many-locals
     ws, new_installation, make_catalog, make_schema, make_table, env_or_skip, make_random, make_dbfs_data_copy