Fix Scramble API docs warnings

Remove redundant @var annotations from API resources and defer the user
access in the email unique rule of UserUpdateRequest, so rules() can be
evaluated by Scramble without route model binding. Add a test that fails
on any Scramble diagnostic and tests for the email unique rule.

app/Http/Resources/V1/Client/ClientResource.php

@@ -21,15 +21,15 @@ class ClientResource extends BaseResource
     public function toArray(Request $request): array
     {
         return [
-            /** @var string $id ID */
+            /** ID */
             'id' => $this->resource->id,
-            /** @var string $name Name */
+            /** Name */
             'name' => $this->resource->name,
-            /** @var bool $is_archived Whether the client is archived */
+            /** Whether the client is archived */
             'is_archived' => $this->resource->is_archived,
-            /** @var string $created_at When the tag was created */
+            /** When the tag was created */
             'created_at' => $this->formatDateTime($this->resource->created_at),
-            /** @var string $updated_at When the tag was last updated */
+            /** When the tag was last updated */
             'updated_at' => $this->formatDateTime($this->resource->updated_at),
         ];
     }