Add Cloudflare system folder "functions" to the hard coded IGNORE list

[goblinfactory]

Add Cloudflare system folder "functions" to the hard coded IGNORE list

Rationale

• For the same reasons as described in Allow users to pass additional IGNORE dirs and filenames from commandline  #198
• Pit of success - Will not require a user who is also using Cloudflare Pages functions, to have to do anything special in order to avoid accidentally publishing artifacts (like developer markdown notes), or secrets.

Impact

• Expected changes are simply adding "functions" to const IGNORE and update tests.

nue/packages/nuekit/src/nuefs.js

Lines 71 to 79 in 16b348a

	const IGNORE = ['node_modules', 'package.json', 'bun.lockb', 'pnpm-lock.yaml']
	function ignore(name='') {
	return '._'.includes(name[0]) || IGNORE.includes(name)
	}
	function isLegit(file) {
	return !ignore(file.name) && !ignore(file.dir)
	}