Remove vscode version checks

[pokey]

Our policy is to support VSCode versions up to a year old. Thus, we bumped our VSCode dependency version in #2273. We can take advantage of this step to remove the following:

• [ ] https://github.com/cursorless-dev/cursorless/blob/de37ebf77834afad9a102cd5a4235886c72ece65/packages/cursorless-vscode/src/ide/vscode/notebook/notebook.ts#L8 (and the legacy code that uses this check)
• [ ] https://github.com/cursorless-dev/cursorless/blob/de37ebf77834afad9a102cd5a4235886c72ece65/packages/cursorless-vscode/src/ide/vscode/VscodeFocusEditor.ts#L65
• [ ] https://github.com/cursorless-dev/cursorless/blob/de37ebf77834afad9a102cd5a4235886c72ece65/packages/cursorless-vscode/package.json#L49-L74 (and the code in meta-updater that generates them)