refactor: use lsp_check_applicable command

[rchl]

LSP had a lsp_check_applicable command for a while to handle copilot use case.

Minor type fixes in the process.

[rchl]

Let's hold off with this. I think there is a bug with that command (it overrides enabled: false).

@jwortmann I have set enabled: false globally for copilot but the lsp_check_applicable command actually makes it start still.

[jwortmann]

@jwortmann I have set enabled: false globally for copilot but the lsp_check_applicable command actually makes it start still.

Yes, I didn't consider someone running the command while the config is disabled. We should probably add a check

if not config.enabled:
    return

after these lines
https://github.com/sublimelsp/LSP/blob/ead1085da645c6ad71e2efa9a3104b276502e605/plugin/core/registry.py#L239-L242

[rchl]

This is ready. The fix for LSP will be released soon but it's not a blocker anyway.

[jfcherng]

This is a simple PR. LGTM.