feat(oidc): more detailed error messages and error validation

[fiftin]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances error handling for OIDC logins by providing more detailed error messages and validations while adding a configuration toggle to disable automatic user creation.

• Adds a new field 'DisableUserCreation' to the OIDC provider configuration in OdbcProvider.go.
• Improves logging in api/login.go by replacing generic log.Error calls with more detailed log.Errorf messages and additional validation around token and user info processing.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
util/OdbcProvider.go	Adds new configuration flag 'DisableUserCreation' to control user creation behavior.
api/login.go	Enhances error logging for OAuth state, token verification, and user retrieval processes.

Comments suppressed due to low confidence (2)

util/OdbcProvider.go:20

• [nitpick] Consider adding a brief inline comment to clarify the purpose and usage of the 'DisableUserCreation' flag for future maintainability.

DisableUserCreation bool `json:"disable_user_creation"`

api/login.go:664

• [nitpick] Consider reusing the error variable 'err' instead of introducing 'err2' multiple times to improve consistency in error handling.

idToken, err2 := verifier.Verify(ctx, rawIDToken)