test: remove 2021 test projects except "HdrpStereoGraphicsTest-2021.3" (#411)

* Remove 2021 projects
* update Yamato job file

Author: sindharta

.yamato/UnityToonShader-test.yml

@@ -7,16 +7,13 @@
 osx_test_projects:
   - project_prefix: HdrpGraphicsTest
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: LegacyGraphicsTest
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
   - project_prefix: UniversalGraphicsTest
     unity_editors:
-      - version: 2021.3
       - version: 6000.0
   - project_prefix: UniversalGraphicsTestECS
     unity_editors:
@@ -28,20 +25,17 @@ win_test_projects:
   - project_prefix: LegacyStereoGraphicsTest
     utr_arguments: --extra-editor-arg="-force-d3d11"
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: HdrpGraphicsTest
     utr_arguments: --extra-editor-arg="-force-d3d11"
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: HdrpGraphicsTest
     key_postfix: _Vulkan
     utr_arguments: 
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: HdrpStereoGraphicsTest
@@ -51,27 +45,23 @@ win_test_projects:
   - project_prefix: LegacyGraphicsTest
     utr_arguments: --extra-editor-arg="-force-d3d11"
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: LegacyGraphicsTest 
     key_postfix: _Vulkan
     utr_arguments: 
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: UniversalGraphicsTest
     utr_arguments: --extra-editor-arg="-force-d3d11"
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: UniversalGraphicsTest
     key_postfix: _Vulkan
     utr_arguments: 
     unity_editors:
-      - version: 2021.3
       - version: 2022.3
       - version: 6000.0
   - project_prefix: UniversalGraphicsTestECS
@@ -88,12 +78,10 @@ win_test_projects:
   - project_prefix: UniversalStereoGraphicsTest
     utr_arguments: --extra-editor-arg="-force-d3d11"
     unity_editors:
-      - version: 2021.3
       - version: 6000.0
   - project_prefix: HdrpDX12GraphicsTest
     utr_arguments:
     unity_editors:
-      - version: 2021.3
       - version: 6000.0