refactor(hooks): deprecate `action:script.load` client-side hook

Use `static:script.init` instead.

public/src/ajaxify.js

@@ -319,9 +319,22 @@ ajaxify = window.ajaxify || {};
 		if (tpl_url.startsWith('admin')) {
 			location = '';
 		}
+
+		require(['hooks', location + tpl_url], (hooks, module) => {
+			if (module && module.init) {
+				module.init();
+			}
+
+			hooks.fire('static:script.init', { tpl_url }).then(ajaxify.loadExtraScripts.bind(null, tpl_url, callback));
+		}, function () {
+			// ignore 404 error
+		});
+	};
+
+	ajaxify.loadExtraScripts = (tpl_url, callback) => {
 		var data = {
 			tpl_url: tpl_url,
-			scripts: [location + tpl_url],
+			scripts: [],
 		};
 
 		$(window).trigger('action:script.load', data);
@@ -329,6 +342,16 @@ ajaxify = window.ajaxify || {};
 		// Require and parse modules
 		var outstanding = data.scripts.length;
 
+		if (outstanding && !app.flags.actionScriptLoadDeprecation) {
+			console.group('Deprecation Notice');
+			console.warn('The "action:script.load" event has been deprecated and will be removed in NodeBB v1.18.0. Please attach a listener to the "static:script.init" client-side hook instead');
+			data.scripts.forEach((script) => {
+				console.info(`Affected script: ${typeof script === 'function' ? script.name || 'anonymous ' + script.toString() : script}`);
+			});
+			console.groupEnd();
+			app.flags.actionScriptLoadDeprecation = 1;
+		}
+
 		data.scripts.map(function (script) {
 			if (typeof script === 'function') {
 				return function (next) {