chore: MFA Method debugging / support improvements

[matthewelwell]

Changes

Add created_at and updated_at to MFAMethod class. Note that I chose not to use auto_now and auto_now_add because I wanted existing records to only be marked as updated once they have in fact been updated to avoid confusion.

How did you test this code?

N/a - trivial changes

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jan 10, 2025 5:58pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jan 10, 2025 5:58pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jan 10, 2025 5:58pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4989	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4989	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4989	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4989	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4989	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4989	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-59787

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4989

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[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.39%. Comparing base (8cd2731) to head (aeab732).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
api/custom_auth/mfa/trench/admin.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4989      +/-   ##
==========================================
- Coverage   97.39%   97.39%   -0.01%     
==========================================
  Files        1191     1192       +1     
  Lines       41633    41652      +19     
==========================================
+ Hits        40549    40567      +18     
- Misses       1084     1085       +1     

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[rolodato]

I don't expect us to actually ever modify existing MFA methods, but ideally we shouldn't allow editing the created/updated_at fields from the details page:

Not a blocker since this still solves the immediate issue, but otherwise LGTM 👍