feat: cxg migration monitoring

[ejmolinelli]

Reason for Change

• view the status of a running migration wholistically
• currently we have to wait for a curation report that is only produced at the end of a migration
• the only alternative is to view jobs/steps on the AWS account one at a time
• provide reports and help investigate errors

Changes

• add migration/ directory

[github-actions]

Deployment Summary

• backend_url: https://pr-7527-backend.rdev.single-cell.czi.technology
• backend_de_url: https://pr-7527-backend-de.rdev.single-cell.czi.technology
• backend_wmg_url: https://pr-7527-backend-wmg.rdev.single-cell.czi.technology
• frontend_url: https://pr-7527-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7527-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7527-migration:1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.07%. Comparing base (5945a05) to head (b4dd044).
Report is 27 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7527   +/-   ##
=======================================
  Coverage   93.07%   93.07%           
=======================================
  Files         196      196           
  Lines       17280    17280           
=======================================
  Hits        16084    16084           
  Misses       1196     1196           

Flag	Coverage Δ
unittests	93.07% <ø> (ø)

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[github-actions]

This PR has not seen any activity in the past 2 weeks; if nobody comments or reviews it in the next 3 days, this PR will be closed.