Add userId extraction support during self registration.

[AfraHussaindeen]

Purpose

• $Subject
• Resolves Expose userId in the result HTML page after successful self-registration. product-is#22275

To be merged after

• Introduce ResolvedUser class carbon-identity-framework#6297
• Introduce ResolvedUser class carbon-identity-framework#6297

Checklist

• e2e cypress tests locally verified. (for internal contributers)
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Relevant backend changes deployed and verified
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines
• Ran FindSecurityBugs plugin and verified report
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.04%. Comparing base (8a9fbe3) to head (df64c8e).
Report is 161 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7314   +/-   ##
=======================================
  Coverage   36.04%   36.04%           
=======================================
  Files          42       42           
  Lines         899      899           
  Branches      205      217   +12     
=======================================
  Hits          324      324           
+ Misses        575      529   -46     
- Partials        0       46   +46     

Flag	Coverage Δ
@wso2is/core	36.04% <ø> (ø)

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[wso2-jenkins-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

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