src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/Extension/localIconUrl
class Extension:	private get localIconUrl(): string | null {
		if (this.local && this.local.manifest.icon) {
			return FileAccess.asBrowserUri(resources.joinPath(this.local.location, this.local.manifest.icon)).toString(true);
		}
		return null;
	}