Revert "Removed unused modal files"

This reverts commit 1b4126b6f0.

- this was in error, `settings/members/archive-tier` wasn't a modal file

ghost/admin/app/components/settings/members/archive-tier.hbs

@@ -0,0 +1,17 @@
+{{#if this.product.active}}
+    {{#unless this.product.isNew}}
+        <button
+            type="button"
+            {{on "click" this.handleArchiveTier}}
+        >
+            <span>Archive</span>
+        </button>
+    {{/unless}}
+{{else}}
+    <button
+        type="button"
+        {{on "click" this.handleUnarchiveTier}}
+    >
+        <span>Reactivate</span>
+    </button>
+{{/if}}

ghost/admin/app/components/settings/members/archive-tier.js

@@ -0,0 +1,42 @@
+import Component from '@glimmer/component';
+import {action} from '@ember/object';
+import {inject as service} from '@ember/service';
+
+export default class ArchiveTierComponent extends Component {
+    @service notifications;
+    @service router;
+    @service modals;
+
+    get isActive() {
+        const {product} = this.args;
+        return !!product.active;
+    }
+
+    get product() {
+        return this.args.product;
+    }
+
+    @action
+    handleArchiveTier() {
+        if (!this.product.isNew) {
+            this.modals.open('modals/tiers/archive', {
+                product: this.product,
+                onArchive: this.args.onArchive
+            }, {
+                className: 'fullscreen-modal fullscreen-modal-action fullscreen-modal-wide'
+            });
+        }
+    }
+
+    @action
+    handleUnarchiveTier() {
+        if (!this.product.isNew) {
+            this.modals.open('modals/tiers/unarchive', {
+                product: this.product,
+                onUnarchive: this.args.onUnarchive
+            }, {
+                className: 'fullscreen-modal fullscreen-modal-action fullscreen-modal-wide'
+            });
+        }
+    }
+}