Turn on code-cov for PR checking of unit test coverage (#36548)

.codecov.yml

@@ -1,27 +1,46 @@
 codecov:
-  notify:
+    notify:
-    require_ci_to_pass: yes
+        require_ci_to_pass: yes
+
+ignore:
+    - '**/tests'
+    - '**/test'
+    - 'tools/**'
+    - 'packages/js/admin-e2e-tests'
+    - 'packages/js/api-core-tests'
+    - 'packages/js/create-woo-extension'
+    - 'packages/js/e2e-core-tests'
+    - 'packages/js/e2e-environment'
+    - 'packages/js/e2e-utils'
+    - 'packages/js/eslint-plugin'
+    - 'packages/js/internal-e2e-builds'
+    - 'packages/js/internal-js-tests'
+    - 'packages/js/internal-style-build'
+    - '**/*.test.*'
 
 coverage:
-  precision: 2
+    precision: 1
-  round: nearest
+    round: nearest
-  range: "50...100"
+    range: '50...80'
-
-  status:
-    project:
-      default:
-        informational: true
-    patch:
-      default:
-        informational: true
-    changes: off
 
+    status:
+        project:
+            default:
+                target: auto
+        patch:
+            default:
+                target: auto
 parsers:
-  gcov:
+    gcov:
-    branch_detection:
+        branch_detection:
-      conditional: yes
+            conditional: yes
-      loop: yes
+            loop: yes
-      method: no
+            method: no
-      macro: no
+            macro: no
 
-comment: false
+comment:
+    layout: 'reach, diff, flags, files'
+    behavior: default
+    require_changes: false
+    require_base: no
+    require_head: yes