Disable tests involving media picker for maintenance (#21428)

Author: tiagomar

WordPress/UITests/JetpackUITests.xctestplan

@@ -23,6 +23,10 @@
       "parallelizable" : true,
       "skippedTests" : [
         "EditorAztecTests",
+        "EditorGutenbergTests\/testAddGalleryBlock()",
+        "EditorGutenbergTests\/testAddMediaBlocks()",
+        "EditorGutenbergTests\/testAddRemoveFeaturedImage()",
+        "EditorGutenbergTests\/testBasicPostPublishWithCategoryAndTag()",
         "LoginTests\/testEmailMagicLinkLogin()",
         "SignupTests",
         "SignupTests\/testEmailSignup()",