fix: resolve 400 error when switching between flexible and legacy password policy on database connections

[ankita10119]

🔧 Changes

When switching a database connection's password policy between flexible (password_options) and legacy (passwordPolicy, password_complexity_options, password_history, password_no_personal_info, password_dictionary), the deploy would fail with a 400 error from the Management API.

The databases handler fetches the existing connection state before updating and shallow-merges it with the desired payload. This caused both policy groups to appear in the PATCH body simultaneously, which Auth0 rejects. The fix strips the conflicting group from the existing connection state before the merge, following the same pattern already used for the attributes vs requires_username/validation conflict in the same method.

Both transitions are fixed:

• Legacy → Flexible: deploying password_options when connection has passwordPolicy set
• Flexible → Legacy: deploying passwordPolicy when connection has password_options set

📚 References

N/A

🔬 Testing

• Covered unit test cases
• Tested with real tenant data

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.03%. Comparing base (8fe0e28) to head (d397f47).

Files with missing lines	Patch %	Lines
src/tools/auth0/handlers/databases.ts	40.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1361      +/-   ##
==========================================
- Coverage   80.10%   80.03%   -0.07%     
==========================================
  Files         152      152              
  Lines        6212     6222      +10     
  Branches     1290     1293       +3     
==========================================
+ Hits         4976     4980       +4     
- Misses        702      707       +5     
- Partials      534      535       +1     

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