fix: strip deprecated enabled_clientsfor connection with enhance client management

[kushalshit27]

🔧 Changes

Core fix: Remove deprecated enabled_clients property from API payloads

• The Auth0 Management API deprecated enabled_clients on the connections create/update endpoints in favor of the dedicated PATCH /v2/connections/{id}/clients endpoint
• Resolves ManagementApiError: Payload validation error: 'Additional properties not allowed: enabled_clients' that blocked import operations when connections include enabled clients
• Compare incoming enabledClientIds with existing enabled clients to determine which clients should be enabled vs. disabled
• Skip API calls entirely when enabled clients are unchanged (performance optimization)
• Properly disable clients that are removed from the list by setting status: false in the update payload

📚 References

• Resolves: #1290
• https://auth0.com/docs/api/management/v2/connections/post-connections
• https://auth0.com/docs/api/management/v2/connections/patch-connections-by-id

🔬 Testing

Unit test coverage:

• Updated existing database and connection handler tests to assert enabled_clients is NOT present in API payloads for create and update operations
• Added 6 new test cases for :
  • Skip update when enabled clients are unchanged (optimization verification)
  • Disable removed clients (verifies status: false for clients no longer in list)
  • Enable new clients and disable removed clients in one operation (combined operations)
  • Handle existingConnections as null (fallback behavior)
  • Handle large combined enable and disable operations (verifies chunking for >50 clients)

📝 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 80.46%. Comparing base (59fe692) to head (03e4ae3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1294      +/-   ##
==========================================
+ Coverage   80.39%   80.46%   +0.07%     
==========================================
  Files         146      146              
  Lines        5825     5846      +21     
  Branches     1194     1202       +8     
==========================================
+ Hits         4683     4704      +21     
  Misses        650      650              
  Partials      492      492              

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