Remove unused emoji script (#28463)

bin/update-emoji

-#!/usr/bin/env node
-
-
-var fs = require("fs");
-
-var emoji;
-try {
-    emoji = require("emojione/emoji.json");
-} catch (e) {
-    console.log("Please `yarn global add emojione` and re-run.");
-    process.exit(1);
-}
-
-var results = {
-    emoji: {},
-    categories: [
-        { id: "people",   name: "Smilies & People" },
-        { id: "nature",   name: "Animals & Nature" },
-        { id: "food",     name: "Food & Drink" },
-        { id: "activity", name: "Activity" },
-        { id: "travel",   name: "Travel & Places" },
-        { id: "objects",  name: "Objects" },
-        { id: "symbols",  name: "Symbols" },
-        { id: "flags",    name: "Flags" }
-    ]
-}
-
-var categoriesMap = {};
-results.categories.forEach(function(category) {
-    categoriesMap[category.id] = category;
-    category.emoji = [];
-});
-
-var orderedEmoji = Object.keys(emoji).map(function(key) { return emoji[key]; });
-orderedEmoji.sort(function(a,b) {
-    return parseInt(a.emoji_order, 10) - parseInt(b.emoji_order, 10);
-});
-
-orderedEmoji.forEach(function(emoji) {
-    var category = categoriesMap[emoji.category];
-    if (category) {
-        category.emoji.push(emoji.shortname);
-        results.emoji[emoji.shortname] = parseInt(emoji.unicode, 16);
-    }
-});
-
-fs.writeFileSync("frontend/src/metabase/lib/emoji.json", JSON.stringify(results));