Remove build-time EUI aliases in yarn clean

[BSFishy]

Is your feature request related to a problem? Please describe.

It's not always desirable to go through the entire build process, for example, I may stop it early if I only want to see the Babel outputs. However, if I stop the build process early, I'll still have a huge number of EUI aliases in my files, which I don't want to push to my remote.

Describe the solution you'd like

It would be nice if the yarn clean script would also remove build-time EUI aliases. The code to do this is in the compile-oui.js file:

oui/scripts/compile-oui.js

Lines 160 to 175 in a1b9029

	function euiBuildTimeAliasTearDown() {
	console.log('Tearing down build-time EUI aliases');
	shell.rm('-rf', 'src/eui_components');
	// Remove any changes made at build time
	shell.ls('src/components/**/*.*').forEach(file => {
	if (/__snapshots__|\.d\.ts|\.test\.|\.scss/.test(file)) return;
	let changed;
	const content = fs.readFileSync(file, 'utf8')
	.replace(/\n\/\* OUI -> EUI Aliases: Build-Time \*\/.*$/mg, () => {
	changed = true;
	return '';
	});
	if (changed) fs.writeFileSync(file, content, 'utf8');
	});
	}

Ideally, this is extracted into a utils.js file, and both the compile-oui.js file and compile-clean.js utilize.

Describe alternatives you've considered

Not doing this, but then I have to wait through the entire build process to get the aliases removed.

Additional context
N/a

[AwesomeSauce42]

Hi, I would like to work on this issue!

[BSFishy]

Hi, I would like to work on this issue!

Great! I assigned it to you. Leave a comment if you get stuck anywhere