changes in user crdential updations and readme

[muhammad-ali-e]

What

• Updated the user update flow in the authentication service to properly handle username and password changes.
• Revised the README in the backend to clarify the authentication flow and environment variable usage.

Why

• Previously, changing the username or password caused the creation of a new user instead of updating the existing user credentials. This update addresses that issue and ensures the correct user is updated with the new credentials.

How

• Fixed the user authentication logic to correctly update existing user credentials instead of creating a new user.

Can this PR break any existing features. If yes, please list possible items. If no, please explain why. (PS: Admins do not merge the PR without this section filled)

• There should be no other significant impact on existing features, It alters how username and password updates are handled.

Database Migrations

• No

Env Config

• No

Relevant Docs

Related Issues or PRs

Dependencies Versions

Notes on Testing

Screenshots

Checklist

I have read and understood the Contribution Guidelines.

[harini-venkataraman]

LGTM, added a minor comment.

[chandrasekharan-zipstack]

LGTM for the most part, left minor comments

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud