Test: Move to new file refactoring

[mjbvz]

Test for #49866
Complexity: 1

• any os @auchenberg
• any os @octref

Summary
The new move to new file refactoring moves class, variable, or function to a new file next to the current file. To use it, put the cursor on a class/var/function name and use the refactor command: ctrl+shift+r

Testing
Try running move to new file in the vs code code base or in other js/ts codebasess. Things to consider:

• Does this action show up when you expect it to?
• Does this action do the correct thing?
• Does this action observe formatting and other users settings properly?