Drop xmodule mixin support from the xblocks-contrib blocks#38264

farhan wants to merge 3 commits intomasteropenedx/openedx-platform:masterfrom

farhan/drop-xmodule-mixin-from-xblocks-contribopenedx/openedx-platform:farhan/drop-xmodule-mixin-from-xblocks-contribCopy head branch name to clipboard