DrupalDotOrgJsonApi.php - legacy code to be removed

Removed the legacy code from DrupalDotOrgJsonApi.php. and raised a MR for this .moving this NR. Kindly review.

@shalini_jha Thanks for working on this one ~~ changes looks quite straightforward.
FYI, these kind of issues should be picked by newbies first. :)
For now I'm marking this one RTBC.

@ankitv18, thanks for your review. However, I started with the Project Browser issue because I wanted to begin with a simple problem to understand the flow better."

thanks!

Automatically closed - issue fixed for 2 weeks with no activity.