Handle passwords containing special characters when updating password via my account

[Yasasr1]

Purpose

When updating the password through the My Account portal, the update request fails if the new password contains special characters from other languages (e.g., ç, æ, ô, £). This occurs due to incorrect encoding when constructing the Authorization header. This PR addresses the issue by correctly encoding these special characters.

Related issue

• Characters inherent to other languages are dropped in change password authorisation header in myaccount app product-is#20957

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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