DEV: Standardize table sorting verbiage (#9757)

* DEV: Standardize table sorting verbiage

This commit creates a common component that tables can use to make their
headers sortable. This commit also standardizes on using `desc` as the
default and passing in the `asc=true` flag to adjust the sorting
direction.

* Add deprecation warnings

Adds deprecation warnings if using previous params and maintains
backwards compatibility. Set the default sort value for group members to
be asc.

* switch group requests to use common table-header-toggle

* update fixture

app/assets/javascripts/admin/components/admin-directory-toggle.js

@@ -1,30 +0,0 @@
-import Component from "@ember/component";
-import { iconHTML } from "discourse-common/lib/icon-library";
-
-export default Component.extend({
-  tagName: "th",
-  classNames: ["sortable"],
-  chevronIcon: null,
-  toggleProperties() {
-    if (this.order === this.field) {
-      this.set("ascending", this.ascending ? null : true);
-    } else {
-      this.setProperties({ order: this.field, ascending: null });
-    }
-  },
-  toggleChevron() {
-    if (this.order === this.field) {
-      let chevron = iconHTML(this.ascending ? "chevron-up" : "chevron-down");
-      this.set("chevronIcon", `${chevron}`.htmlSafe());
-    } else {
-      this.set("chevronIcon", null);
-    }
-  },
-  click() {
-    this.toggleProperties();
-  },
-  didReceiveAttrs() {
-    this._super(...arguments);
-    this.toggleChevron();
-  }
-});