fix: signin/idtoken: insert user provider if user provider not found

[dbarrosop]

PR Type

Bug fix, Tests

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Description

• Added a new boolean return value in postSigninIdtokenCheckUserExists to indicate if the provider was found.
• Updated PostSigninIdtoken to handle the new return value and insert the user provider if not found.
• Enhanced test cases to mock and verify the insertion of user provider during sign-in.

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Changes walkthrough 📝

	Relevant files
Bug fix	post_signin_idtoken.go Handle missing user provider during sign-in                            go/controller/post_signin_idtoken.go Added a new boolean return value to indicate if the provider was found. Updated the postSigninIdtokenCheckUserExists function to handle the new return value. Modified the PostSigninIdtoken function to use the new return value. Inserted user provider if not found during sign-in. +26/-9
Tests	post_signin_idtoken_test.go Add tests for inserting user provider during sign-in          go/controller/post_signin_idtoken_test.go Added test cases to mock InsertUserProvider function. Verified the insertion of user provider when not found. +20/-0

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Possible Bug The function postSigninIdtokenCheckUserExists now returns four values, but the handling of these return values should be carefully reviewed to ensure that all possible cases are correctly managed, especially the new boolean flags. Code Smell The postSigninIdtokenSignin function now includes logic to insert a user provider if not found. This could be refactored to separate concerns and improve readability.

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