Set root domain of custom domain for ALOR cookie

[Yoshani]

Purpose

Set the root domain of proxy hostname in ALOR cookie. This is to resolve the cross-domain blocking issue when we use a static domain value even if custom domain has been configured.

Related issues

• Issue Auto login does not work when self registering in a custom domain configured org product-is#21135

Related PRs

• Add util method to check sub domain carbon-identity-framework#5941
• Add util method to get root domain carbon-identity-framework#5944

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 31.79%. Comparing base (27597ab) to head (32eeb23).
Report is 25 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6904   +/-   ##
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  Coverage   31.79%   31.79%           
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  Files          41       41           
  Lines         890      890           
  Branches      220      220           
=======================================
  Hits          283      283           
  Misses        557      557           
  Partials       50       50           

Flag	Coverage Δ
@wso2is/core	31.79% <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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