perf: lazy load tag list for awesome bar

In last 7 days not a single person has used this feature on FC (based on
endpoint logs).

fix: When user knowingly triggers by typing text starting with `#` we
fire request to get tags lazily.

frappe/public/js/frappe/ui/toolbar/awesome_bar.js

@@ -127,7 +127,6 @@ frappe.search.AwesomeBar = class AwesomeBar {
 			}
 		});
 		frappe.search.utils.setup_recent();
-		frappe.tags.utils.fetch_tags();
 	}
 
 	add_help() {

frappe/public/js/frappe/ui/toolbar/tag_utils.js

@@ -8,6 +8,11 @@ frappe.tags.utils = {
 		txt = txt.slice(1);
 		let out = [];
 
+		if (!frappe.tags.tags) {
+			frappe.tags.utils.fetch_tags();
+			return [];
+		}
+
 		for (let i in frappe.tags.tags) {
 			let tag = frappe.tags.tags[i];
 			let level = frappe.search.utils.fuzzy_search(txt, tag);