Thanks @kunalkursija. I have made some changes and updated the patch specific...

Thanks @kunalkursija. I have made some changes and updated the patch specifically for 8.x-4.3.

Also, i have added the cleanup functionalty to purge the Linkit plugin entries from CKEditor text formats when the Linkit module is uninstalled.

I think i will also need to roll out another patch for 8.x-5.x as there is an implementation change in the CKEditor Linkit plugin.