mgr/dashboard: fix rgw display name validation

the dot(.) character is allowed in full name

Fixes: https://tracker.ceph.com/issues/65146
Signed-off-by: Nizamudeen A <[email protected]>

Author: nizamial09

src/pybind/mgr/dashboard/frontend/src/app/ceph/rgw/rgw-user-form/rgw-user-form.component.ts

@@ -98,7 +98,10 @@ export class RgwUserFormComponent extends CdForm implements OnInit {
               )
             ]
       ],
-      display_name: [null, [Validators.required, Validators.pattern(/^[a-zA-Z0-9!@#%^&*()_ -]+$/)]],
+      display_name: [
+        null,
+        [Validators.required, Validators.pattern(/^[a-zA-Z0-9!@#%^&*()._ -]+$/)]
+      ],
       email: [
         null,
         [CdValidators.email],