chore: add filter descendants to gitignore and remove from git tree

[atarashansky]

Reason for Change

• #TICKET_NUMBER
• If the reason for this PR's code changes are not clear in the issue, state value/impact

Changes

• add
• remove
• modify

Testing steps

• Either list QA steps or reasoning you feel QA is unnecessary
• Describe how you made sure to know that your changes worked. Should allow someone else to go verify your code without in depth knowledge.
• "Unit tested only", "tested in rdev by a, b, c, verifying feature worked by... ", "manually ran pipeline locally with these results: ..."

Checklist 🛎️

• Add product, design, and eng as reviewers for rdev review
• For UI changes, add screenshots/videos, so the reviewers know what you expect them to see
• For UI changes, add e2e tests to prevent regressions
• For UI changes, verify impacted analytics events still work

Notes for Reviewer

[github-actions]

Deployment Summary

• backend_url: https://pr-7013-backend.rdev.single-cell.czi.technology
• frontend_url: https://pr-7013-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7013-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7013-migration:1

[atarashansky]

These no longer exist, so remove them from .gitignore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.59%. Comparing base (42f40e9) to head (d771ec6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7013   +/-   ##
=======================================
  Coverage   91.59%   91.59%           
=======================================
  Files         182      182           
  Lines       15519    15519           
=======================================
  Hits        14214    14214           
  Misses       1305     1305           

Flag	Coverage Δ
unittests	91.59% <ø> (ø)

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