Update to emojimart 2.6.1 (#7746)

Update to emojimart 2.6.1 (#7746)

* Update to emojimart 2.6.1
WIP using local updated version. Sheet comes from emoji-data@4.0.4,
file sheet_twitter_32_indexed_256.png.

* Update to 2.6.1 and uncompress data if needed

* Remove changes that were not needed

* Fix yarn lock file

* Match emojiToShowFilter behavior to new version of emoji-mart

* Fix codeclimate issue

* Match custom emoji behavior to new version of emoji-mart

* Replace emoji without shortcode in tests

* Fix code climate issues