Reduce Codecov's patch target to 60% (#20095)

* Reduce Codecov's patch target to 50%

* Update codecov.yml

After internal discussion, settled on 60% as the floor for the baseline.

* Code Cov note in PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -60,6 +60,7 @@ _For more info, check out the
 [Forem Accessibility Docs](https://developers.forem.com/frontend/accessibility)._
 
 ## Added/updated tests?
+_We encourage you to keep the code coverage percentage at 80% and above._
 
 - [ ] Yes
 - [ ] No, and this is why: _please replace this line with details on why tests

codecov.yml

@@ -18,7 +18,7 @@ coverage:
   status:
     patch:
       default:
-        target: 85%
+        target: 60%
     project: false
 flag_management:
   default_rules: