[5.0] Finally delete deprecated javascript assets from PR's #38823 and #39374#40302

HLeithner merged 4 commits intojoomla:5.0-devjoomla/joomla-cms:5.0-devfrom

richard67:5.0-dev-finally-remove-js-files-from-pr-39431richard67/joomla-cms:5.0-dev-finally-remove-js-files-from-pr-39431Copy head branch name to clipboard