[OB3] Fix FAPI 1 advance sub claim inconsistent issue

[hasithakn]

[OB3] Fix FAPI 1 advance sub claim inconsistent issue

This PR fix the id_token's sub claim is not consistent in auth flow and token flow. Hence this fails the below test from FAPI 1 Advance suite.

Auth flow id token's sub value : [email protected]@carbon.super
Token flow id token's sub value : [email protected]

Test name: fapi1-advanced-final

Issue link: https://github.com/wso2-enterprise/ob-compliance-toolkit-uk/issues/474

Doc Issue:

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Development Checklist

1. Built complete solution with pull request in place.
2. Ran checkstyle plugin with pull request in place.
3. Ran Findbugs plugin with pull request in place.
4. Ran FindSecurityBugs plugin and verified report.
5. Formatted code according to WSO2 code style.
6. Have you verify the PR does't commit any keys, passwords, tokens, usernames, or other secrets?
7. Migration scripts written (if applicable).
8. Have you followed secure coding standards in WSO2 Secure Engineering Guidelines?

Testing Checklist

1. Written unit tests.
2. Documented test scenarios(link available in guides).
3. Written automation tests (link available in guides).
4. Verified tests in multiple database environments (if applicable).
5. Verified tests in multiple deployed specifications (if applicable).
6. Tested with OBBI enabled (if applicable).
7. Tested with specification regulatory conformance suites (if applicable).

Automation Test Details

Test Suite	Test Script IDs
Integration Suite	TCXXXXX, TCXXXX

Conformance Tests Details

Test Suite Name	Test Suite Version	Scenarios	Result
Security Suite	VX.X	Foo, Bar	Passed

Resources

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