[Saved Objects Tagging] Visually hide tags in Saved Objects Management (

#197423)

## Summary

This PR visually hides objects with `tag` type from `Saved Objects
Management` table while still allowing them to be exportable.

Closes: #147786

src/plugins/saved_objects_management/public/management_section/objects_table/saved_objects_table.test.tsx

@@ -51,7 +51,9 @@ const convertType = (type: string): SavedObjectManagementTypeInfo => ({
   namespaceType: 'single',
 });
 
-const allowedTypes = ['index-pattern', 'visualization', 'dashboard', 'search'].map(convertType);
+const allowedTypes = ['index-pattern', 'visualization', 'dashboard', 'search', 'tag'].map(
+  convertType
+);
 
 const allSavedObjects = [
   {
@@ -82,6 +84,13 @@ const allSavedObjects = [
       title: `MyViz`,
     },
   },
+  {
+    id: '5',
+    type: 'tag',
+    attributes: {
+      title: `HelloWorldTag`,
+    },
+  },
 ];
 
 describe('SavedObjectsTable', () => {
@@ -129,6 +138,7 @@ describe('SavedObjectsTable', () => {
       visualization: 0,
       dashboard: 0,
       search: 0,
+      tag: 0,
     });
 
     defaultProps = {
@@ -148,7 +158,7 @@ describe('SavedObjectsTable', () => {
     };
 
     findObjectsMock.mockImplementation(() => ({
-      total: 4,
+      total: 5,
       saved_objects: [
         {
           id: '1',
@@ -199,6 +209,14 @@ describe('SavedObjectsTable', () => {
             },
           },
         },
+        {
+          id: '5',
+          type: 'tag',
+          meta: {
+            title: `HelloWorldTag`,
+            icon: 'tag',
+          },
+        },
       ],
     }));
   });
@@ -451,7 +469,7 @@ describe('SavedObjectsTable', () => {
       component.update();
 
       await component.instance().getRelationships('search', '1');
-      const savedObjectTypes = ['index-pattern', 'visualization', 'dashboard', 'search'];
+      const savedObjectTypes = ['index-pattern', 'visualization', 'dashboard', 'search', 'tag'];
       expect(getRelationshipsMock).toHaveBeenCalledWith(http, 'search', '1', savedObjectTypes);
     });
 

src/plugins/saved_objects_management/public/management_section/objects_table/saved_objects_table.tsx

@@ -688,7 +688,10 @@ export class SavedObjectsTable extends Component<SavedObjectsTableProps, SavedOb
       onSelectionChange: this.onSelectionChanged,
     };
 
-    const filterOptions = allowedTypes.map((type) => ({
+    const filtersWithoutTags = allowedTypes.filter((t) => t.name !== 'tag');
+    const itemsWithoutTags = savedObjects.filter((t) => t.type !== 'tag');
+
+    const filterOptions = filtersWithoutTags.map((type) => ({
       value: type.displayName,
       name: type.displayName,
       view: `${type.displayName} (${savedObjectCounts[type.name] || 0})`,
@@ -733,7 +736,7 @@ export class SavedObjectsTable extends Component<SavedObjectsTableProps, SavedOb
             pageIndex={page}
             pageSize={perPage}
             sort={sort}
-            items={savedObjects}
+            items={itemsWithoutTags}
             totalItemCount={filteredItemCount}
             isSearching={isSearching}
             onShowRelationships={this.onShowRelationships}