Migration of One tap to FedCM

[mchirag2002]

Description

This PR will migrate the one-tap login functionality to FedCM.

Technical Implementation

Added data-use_fedcm_for_prompt="true" attribute to the one-tap prompt markup.

Fixes/Covers

https://github.com/rtCamp/login-with-google/issues/179

[github-actions[bot]]

Code coverage report: https://gh-reports.rt.gw/login-with-google/refs/pull/182/merge/

[SH4LIN]

@mchirag2002 Have you followed all the applicable migration steps?

[github-actions[bot]]

Code coverage report: https://gh-reports.rt.gw/login-with-google/refs/pull/182/merge/