feat: my settings page tests

[ahmadshaheer]

Summary

Test cases:

• Should display Dark and Light theme buttons properly
• Should activate Dark and Light buttons on click
• Should switch the them on clicking Light theme
• Should properly display the User Details Form
• Should update the name on clicking Update button
• Should redirect to /login on clicking Logout
• Should properly display the Password Reset Form
• Should display validation error if password is less than 8 characters
• Should check if the "Change Password" button is disabled in case current / new password is less than 8 characters

Related Issues / PR's

close #5501

Screenshots

NA

Affected Areas and Manually Tested Areas

[github-actions]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[vikrantgupta25]

please take care of the comments. rest LGTM

[SagarRajput-7]

@ahmadshaheer - build is failing please check -

`/home/runner/work/signoz/signoz/frontend/src/mocks-server/handlers.ts
  167:5  error  Parsing error: ',' expected

/home/runner/work/signoz/signoz/frontend/src/mocks-server/server.ts
  4:26  error  Parse errors in imported module './handlers': ',' expected. (167:5)  import/namespace`