fix(grafana): update migration to noop on table name

[matthewelwell]

Changes

Fixes db schema mismatch error caused by #4400 by ensuring the table is not renamed.

How did you test this code?

1. Checked out main branch
2. Rolled original migration back (python manage.py migrate grafana 0001)
3. Checked out this branch
4. Rolled migration forwards again and verified that database schema looks correct

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Sep 3, 2024 9:47am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Sep 3, 2024 9:47am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Sep 3, 2024 9:47am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4571	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4571	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4571	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4571	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4571	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4571	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-55825 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.14%. Comparing base (8e371a8) to head (ace36af).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4571   +/-   ##
=======================================
  Coverage   97.14%   97.14%           
=======================================
  Files        1154     1154           
  Lines       39816    39818    +2     
=======================================
+ Hits        38679    38681    +2     
  Misses       1137     1137           

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