Legacy build code should be sanitized for SWC -> ESBuild

[anonhostpi]

As of the following commit, SWC is no longer used for building and has been replaced with ESBuild

• c1fb732

Symbols like these should be corrected as not to mislead new developers:

openvscode-server/build/gulpfile.js

Lines 22 to 24 in 42e8ff0

	// SWC Client Transpile
	const transpileClientSWCTask = task.define('transpile-client-esbuild', task.series(util.rimraf('out'), transpileTask('src', 'out', true)));
	gulp.task(transpileClientSWCTask);