Disable parallelizable tests due to CI

Kingfisher.xcodeproj/xcshareddata/xcschemes/Kingfisher-macOS.xcscheme

@@ -29,9 +29,7 @@
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
-            skipped = "NO"
-            parallelizable = "YES"
-            testExecutionOrdering = "random">
+            skipped = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "D10EC2301C3D632300A4211C"

Kingfisher.xcodeproj/xcshareddata/xcschemes/Kingfisher-tvOS.xcscheme

@@ -29,9 +29,7 @@
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
-            skipped = "NO"
-            parallelizable = "YES"
-            testExecutionOrdering = "random">
+            skipped = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "4B37667E1C478F940001443F"

Kingfisher.xcodeproj/xcshareddata/xcschemes/Kingfisher.xcscheme

@@ -29,9 +29,7 @@
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
-            skipped = "NO"
-            parallelizable = "YES"
-            testExecutionOrdering = "random">
+            skipped = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "D1ED2D3E1AD2D09F00CFC3EB"