[🧹 UNIFICATION CLEANUP] Refactor SaaS My Account settings related code

[brionmario]

Purpose

My Account is registered as a tenanted app from WSO2 IS 7.0 onwards, hence we don't need the previous SaaS mode settings related code.

Related Issues

• Refactor features and remove redundant ones product-is#20802

Related PRs

• framework: [🧹 UNIFICATION CLEANUP] Remove redundant applications.myaccount.saasMyaccountSettings carbon-identity-framework#5898

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

[wso2-jenkins-bot]

🦋 Changeset detected

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

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