Remove Run Selection/Line in Terminal and Django from command palette

[anthonykim1]

Remove two dropdown in the screenshot that pertains to Run Selection/Line in Terminal and Django.
These command palette option provides awkward workflow that we don't want to promote and does not respect the setting, dynamic change of the option We provide for editor right click => Python => Run selection REPL (or terminal) workflow.

[cpinamtz]

In the opened PR, it was removed only the commands from the *.json files spite of there are still their references in the constants.ts file and more code related to the commands themselves.

In case it's needed to remove also how both commands are registered and all the code related to those functions, please let me know in a more detailed way.

Thanks!