PR Feedback. (#5173)

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

 {% metadata_file .yamato/coverage_tests.metafile %}
 test_editors:
     - version: 2019.4
-      enableCodeCoverage: !!bool true
-      enableCodeCoverage: !!bool true
-      enableCodeCoverage: !!bool true
       testProject: DevProject
       enableNoDefaultPackages: !!bool true
 
-      enableCodeCoverage: !!bool false
       testProject: DevProject
 
 test_platforms:
   {% for editor in trunk_editor %}
   {% for platform in test_platforms %}
 
-  {% if editor.enableCodeCoverage %}
-  {% capture coverageOptions %} --enable-code-coverage --code-coverage-options 'generateHtmlReport;assemblyFilters:+{{ package.assembly }}'{% endcapture %}
-    {% else %}
-    {% assign coverageOptions = "" %}
-    {% endif %}
 test_{{ package.name }}_{{ platform.name }}_trunk:
     name : {{ package.name }} test {{ editor.version }} on {{ platform.name }}
     agent:
         - python3 -m pip install unity-downloader-cli --index-url https://artifactory.prd.it.unity3d.com/artifactory/api/pypi/pypi/simple --upgrade
         - unity-downloader-cli -u trunk -c editor --wait --fast
         - npm install upm-ci-utils@stable -g --registry https://artifactory.prd.cds.internal.unity3d.com/artifactory/api/npm/upm-npm
-        - upm-ci project test -u {{ editor.version }} --project-path {{ editor.testProject }} --package-filter {{ package.name }} {{ coverageOptions }} --extra-create-project-arg="-upmNoDefaultPackages" --extra-utr-arg "reruncount=2"
-      {% if editor.enableCodeCoverage %}
-        - python3 ml-agents/tests/yamato/check_coverage_percent.py upm-ci~/test-results/ {{ package.minCoveragePct }}
-      {% endif %}
+        - upm-ci project test -u {{ editor.version }} --project-path {{ editor.testProject }} --package-filter {{ package.name }} --extra-create-project-arg="-upmNoDefaultPackages" --extra-utr-arg "reruncount=2"
     artifacts:
         logs:
             paths:

com.unity.ml-agents/Runtime/Sensors/RayPerceptionSensorComponent2D.cs

     [AddComponentMenu("ML Agents/Ray Perception Sensor 2D", (int)MenuGroup.Sensors)]
     public class RayPerceptionSensorComponent2D : RayPerceptionSensorComponentBase
     {
-        /// <summary>
-        /// Initializes the raycast sensor component.
-        /// </summary>
-        public RayPerceptionSensorComponent2D()
-        {
-            // Set to the 2D defaults (just in case they ever diverge).
-            RayLayerMask = -5;
-        }
-
         /// <inheritdoc/>
         public override RayPerceptionCastType GetCastType()
         {