feat: Add directory provisioning configuration list fetching connections

[kushalshit27]

🔧 Changes

• Updated the connections handler to fetch directory provisioning configurations using the list endpoint instead of get for each connection.
• This is an optimisation; there should be no changes in the existing user flow.

🔬 Testing

• Updated unit tests to verify the new list based retrieval logic.
• Verify npm test passes.

📝 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.38%. Comparing base (0c86dbd) to head (c6515d3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1284      +/-   ##
==========================================
+ Coverage   80.28%   80.38%   +0.10%     
==========================================
  Files         146      146              
  Lines        5823     5813      -10     
  Branches     1193     1190       -3     
==========================================
- Hits         4675     4673       -2     
+ Misses        655      649       -6     
+ Partials      493      491       -2     

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