fix(auth): properly clear refreshToken in database upon user logout

[yntpdotme]

Description

This PR addresses issue #147, where the refreshToken value in the database is not properly cleared when users log out. The bug occurs due to setting the refreshToken to undefined, which does not update the database as expected.

Changes Made:

It updates the logout endpoint to set the refreshToken to an empty string ('') instead of undefined, ensuring that it is correctly updated in the database when users log out.

Testing:

• Manually tested logout functionality to verify successful clearing of refreshToken.
• Checked for any unintended side effects or regressions.

Additional Notes:

• No changes to the existing API contract or external behavior are introduced by this fix.
• The code has been reviewed and follows the coding standards and conventions of the project.

Related Issue:

• Issue BUG: refreshToken not properly cleared in database upon user logout #147

Screenshots:

• Login

• 
  

• Logout

• 
  

[arnb-smnta]

Its correct I have tested it
But I cant merge it

[yntpdotme]

Thanks @arnb-smnta..!!

Let's wait @wajeshubham will evaluate and merge the changes.

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