Feature/istwcms 4473 l26yan update layout builder browser to 8.x 1.2
requested to merge feature/ISTWCMS-4473-l26yan-Update-layout_builder_browser-to-8.x-1.2 into 8.x-3.x
ISTWCMS 4473 update layout builder browser to 8.x 1.2 layoutBuilderBrowserTest function