docs: added documentation on testing tools (#8939)

- Added documentation on how to use Medusa's tools from the `medusa-test-utils` package to create integration and unit tests.
- Added a manual reference on the `medusaIntegrationTestRunner` and `moduleIntegrationTestRunner` functions. Since the typings in the source code aren't very informative, I opted for a manual reference shedding light on the important bits.

Closes DOCS-852

www/apps/resources/generated/edit-dates.mjs

@@ -773,6 +773,9 @@ export const generatedEditDates = {
   "references/types/HttpTypes/interfaces/types.HttpTypes.AdminWorkflowExecution/page.mdx": "2024-08-30T00:11:02.510Z",
   "references/types/HttpTypes/interfaces/types.HttpTypes.AdminWorkflowExecutionResponse/page.mdx": "2024-08-30T00:11:02.514Z",
   "references/types/interfaces/types.BaseReturnItem/page.mdx": "2024-08-30T00:11:02.538Z",
+  "app/test-tools-reference/medusaIntegrationTestRunner/page.mdx": "2024-09-02T12:12:48.492Z",
+  "app/test-tools-reference/moduleIntegrationTestRunner/page.mdx": "2024-09-02T12:18:33.134Z",
+  "app/test-tools-reference/page.mdx": "2024-09-02T12:25:44.922Z",
   "references/types/HttpTypes/interfaces/types.HttpTypes.AdminGetInvitesParams/page.mdx": "2024-09-03T00:10:55.319Z",
   "references/types/HttpTypes/interfaces/types.HttpTypes.AdminInventoryLevel/page.mdx": "2024-09-03T00:10:55.295Z",
   "references/types/HttpTypes/interfaces/types.HttpTypes.BaseAddress/page.mdx": "2024-09-03T00:10:55.003Z",

www/apps/resources/generated/files-map.mjs

@@ -1011,6 +1011,18 @@ export const filesMap = [
     "filePath": "/www/apps/resources/app/storefront-development/tips/page.mdx",
     "pathname": "/storefront-development/tips"
   },
+  {
+    "filePath": "/www/apps/resources/app/test-tools-reference/medusaIntegrationTestRunner/page.mdx",
+    "pathname": "/test-tools-reference/medusaIntegrationTestRunner"
+  },
+  {
+    "filePath": "/www/apps/resources/app/test-tools-reference/moduleIntegrationTestRunner/page.mdx",
+    "pathname": "/test-tools-reference/moduleIntegrationTestRunner"
+  },
+  {
+    "filePath": "/www/apps/resources/app/test-tools-reference/page.mdx",
+    "pathname": "/test-tools-reference"
+  },
   {
     "filePath": "/www/apps/resources/app/troubleshooting/cors-errors/page.mdx",
     "pathname": "/troubleshooting/cors-errors"

www/apps/resources/generated/sidebar.mjs

@@ -13987,6 +13987,40 @@ export const generatedSidebar = [
             "initialOpen": false
           }
         ]
+      },
+      {
+        "loaded": true,
+        "isPathHref": true,
+        "type": "link",
+        "title": "Testing Tools Reference",
+        "path": "/test-tools-reference",
+        "isChildSidebar": true,
+        "children": [
+          {
+            "loaded": true,
+            "isPathHref": true,
+            "type": "category",
+            "title": "Functions",
+            "children": [
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "type": "link",
+                "title": "medusaIntegrationTestRunner",
+                "path": "/test-tools-reference/medusaIntegrationTestRunner",
+                "children": []
+              },
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "type": "link",
+                "title": "moduleIntegrationTestRunner",
+                "path": "/test-tools-reference/moduleIntegrationTestRunner",
+                "children": []
+              }
+            ]
+          }
+        ]
       }
     ]
   },