switch builds that depend on standalone player back to mac

.yamato/compressed-sensor-test.yml

 test_compressed_obs_{{ editor.version }}:
   name: Test Compressed Sensor Observation {{ editor.version }}
   agent:
-    type: Unity::VM
-    image: package-ci/ubuntu:stable
+    type: Unity::VM::osx
+    image: package-ci/mac:stable
     flavor: b1.small
   variables:
     UNITY_VERSION: {{ editor.version }}

.yamato/gym-interface-test.yml

 test_gym_interface_{{ editor.version }}:
   name: Test Mac Gym Interface {{ editor.version }}
   agent:
-    type: Unity::VM
-    image: package-ci/ubuntu:stable
+    type: Unity::VM::osx
+    image: package-ci/mac:stable
     flavor: b1.small
   variables:
     UNITY_VERSION: {{ editor.version }}

.yamato/python-ll-api-test.yml

 test_mac_ll_api_{{ editor.version }}:
   name: Test Mac LL-API {{ editor.version }}
   agent:
-    type: Unity::VM
-    image: package-ci/ubuntu:stable
+    type: Unity::VM::osx
+    image: package-ci/mac:stable
     flavor: b1.small
   variables:
     UNITY_VERSION: {{ editor.version }}

.yamato/standalone-build-test.yml

 test_mac_standalone_{{ editor.version }}:
   name: Test Mac Standalone {{ editor.version }}
   agent:
-    type: Unity::VM
-    image: package-ci/ubuntu:stable
+    type: Unity::VM::osx
+    image: package-ci/mac:stable
     flavor: i1.small
   variables:
     UNITY_VERSION: {{ editor.version }}