Wordpress - How to remove the core embed blocks in WordPress 5.6?

With WordPress 5.6 (Gutenberg v8.8.0), the implementation of the core-embed/* blocks changed (see pull request #24090: Refactor embed block to single block with block variations). There are now 43 blocks with block variations of the core/embed block.

Available core blocks are:

core/paragraph
core/image
core/heading
core/gallery
core/list
core/quote
core/shortcode
core/archives
core/audio
core/button
core/buttons
core/calendar
core/categories
core/code
core/columns
core/column
core/cover
core/embed
core/file
core/group
core/freeform
core/html
core/media-text
core/latest-comments
core/latest-posts
core/missing
core/more
core/nextpage
core/preformatted
core/pullquote
core/rss
core/search
core/separator
core/block
core/social-links
core/social-link
core/spacer
core/subhead
core/table
core/tag-cloud
core/text-columns
core/verse
core/video

Unregister embeds altogether (including variations):

wp.domReady(function () {
  wp.blocks.unregisterBlockType('core/embed');
});

The blocks previously listed as core-embed/* are now available as a variation of core/embed:

console.table(wp.blocks.getBlockVariations('core/embed'));

Available block variations of core/embed are:

amazon-kindle
animoto
cloudup
collegehumor
crowdsignal
dailymotion
facebook
flickr
imgur
instagram
issuu
kickstarter
meetup-com
mixcloud
reddit
reverbnation
screencast
scribd
slideshare
smugmug
soundcloud
speaker-deck
spotify
ted
tiktok
tumblr
twitter
videopress
vimeo
wordpress
wordpress-tv
youtube

You can unregister a single variation like this:

wp.domReady(function () {
  wp.blocks.unregisterBlockVariation('core/embed', 'twitter');
});

Or unregister all variations and only allow individual variations:

wp.domReady(function () {
  const allowedEmbedBlocks = [
    'vimeo',
    'youtube',
  ];
  wp.blocks.getBlockVariations('core/embed').forEach(function (blockVariation) {
    if (-1 === allowedEmbedBlocks.indexOf(blockVariation.name)) {
      wp.blocks.unregisterBlockVariation('core/embed', blockVariation.name);
    }
  });
});