Let migration status test have one assert

[JCZuurmond]

Changes

Reqwrite migration status test to have one assert in an attempt to better understand when it fails.

Linked issues

Hopefully provides more information for #1615

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

• manually tested
• added unit tests
• added integration tests
• verified on staging environment (screenshot attached)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.10%. Comparing base (0a47514) to head (f67dece).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1651   +/-   ##
=======================================
  Coverage   90.10%   90.10%           
=======================================
  Files          86       86           
  Lines       10568    10568           
  Branches     1863     1863           
=======================================
  Hits         9522     9522           
  Misses        684      684           
  Partials      362      362           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

✅ 160/160 passed, 1 flaky, 25 skipped, 2h0m58s total

Flaky tests:

• 🤪 test_table_migration_job_refreshes_migration_status[regular-migrate-tables] (3m35.462s)

_{Running from acceptance #3008}