Re-enable Unity trunk ml-agents tests

Author: alexander-suvorov

.yamato/com.unity.ml-agents-test.yml

@@ -8,11 +8,8 @@ test_editors:
       enableNoDefaultPackages: !!bool true
 
 trunk_editor:
-   # TODO: re-enable trunk tests after adding support for Unity 6. As of 12 Mar 2024, tests fail
-   # with "Error: '6000.0.0b12' is not a valid Unity version"
-   # - version: trunk
-   #     # Workaround for MLA-1596 - need to make sure we load the right results.
-   #   testProject: DevProject
+    - version: trunk
+      testProject: DevProject
 
 test_platforms:
     - name: win