Start native repl command should put the focus in input box

[amunger]

We recently changed the focus behavior to keep focus in a text editor when sending code to the REPL, but running the start REPL command actually still should send focus to the new editor.

cc @anthonykim1

[anthonykim1]

This is closed via: #24148
verification steps:

1. Latest pre-release Python extension
2. Run command: Run native REPL
3. Observe focus is on the input box of the native repl and not the editor itself.