chore(lsp): rename client-side command invocations

[nayeemrmn]

Addresses TODOs from https://github.com/denoland/vscode_deno/blob/3.33.3/client/src/extension.ts#L206-L217 partly. These aliases have existed for a long while now.

Also no longer require "enableBuiltinCommands": true to enable the server-defined commands. This existed because there used to be an overlap between commands defined on the client and server which would cause an error. That also hasn't been the case for a long while.