mgmt: Adds missing fields in Create/Update connections

[kailash-b]

Changes

Adds missing fields to the Create and Update connection models to align with the Management API spec.

New models:

• ConnectionAuthenticationPurpose – configures the purpose of a connection for authentication during login (active flag).
• ConnectionConnectedAccountsPurpose – configures the purpose of a connection for connected accounts and Token Vault (active, cross_app_access).
• ConnectionOptionsFederatedConnectionsAccessTokens – enables refresh tokens and access tokens collection for federated connections (active).

Extended existing models:

• ConnectionBase – added Authentication (ConnectionAuthenticationPurpose) and ConnectedAccounts (ConnectionConnectedAccountsPurpose) properties.
• ConnectionOptions – added FederatedConnectionsAccessTokens (ConnectionOptionsFederatedConnectionsAccessTokens) property. Fixed an incorrect <inheritdoc> reference on GatewayAuthentication.
• ConnectionOptionsAttributeIdentifier – added DefaultMethod property backed by the new ConnectionOptionsAttributeDefaultMethod enum (password, email_otp).
• ConnectionOptionsPasswordAuthenticationMethod – added ApiBehavior (required | optional) and SignupBehavior (allow | block) properties backed by new enums.
• ConnectionOptionsEmailAttribute – added Unique boolean property.
• Added ConnectionOptionsEmailOtpAuthenticationMethod and ConnectionOptionsPhoneOtpAuthenticationMethod classes.

References

Fixes #924

Testing

Integration tests in ConnectionTests.cs were updated to exercise the newly added fields:

• ConnectionOptionsEmailAttribute.Unique is set to true in the test fixture.
• ConnectionOptionsPasswordAuthenticationMethod.ApiBehavior and SignupBehavior are set to Required and Allow respectively.

Checklist

• All new/changed/fixed functionality is tested
• All tests pass locally
• The changelog has been updated (if applicable)

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.37%. Comparing base (32b8f91) to head (87429bd).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
.../Connections/ConnectionConnectedAccountsPurpose.cs	50.00%	1 Missing ⚠️
...nnectionOptionsFederatedConnectionsAccessTokens.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #929      +/-   ##
==========================================
+ Coverage   79.36%   79.37%   +0.01%     
==========================================
  Files         458      461       +3     
  Lines        5960     5973      +13     
  Branches      283      283              
==========================================
+ Hits         4730     4741      +11     
- Misses       1137     1139       +2     
  Partials       93       93              

Flag	Coverage Δ
authIntTests	30.72% <53.84%> (+0.05%)	⬆️
mgmtIntTests	59.55% <84.61%> (-1.04%)	⬇️
unittests	10.38% <0.00%> (-0.03%)	⬇️

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