use codecov projects (#4120)

.github/workflows/main.yml

@@ -66,7 +66,6 @@ jobs:
         with:
           file: ./coverage.xml
           name: ${{ matrix.os }}
-          fail_ci_if_error: false
   test-unsupported-python-version:
     runs-on: ubuntu-latest
     steps:
@@ -142,7 +141,6 @@ jobs:
         with:
           file: ./web/coverage/coverage-final.json
           name: web
-          fail_ci_if_error: false
 
   docs:
     env:

codecov.yml

@@ -1 +1,15 @@
 comment: off
+coverage:
+  status:
+    project:
+      default: false  # disable the default status that measures entire project
+      python:
+        threshold: 0.1%
+        paths:
+          - "!web/"
+      web:
+        paths:
+          - "web/"
+codecov:
+  notify:
+    after_n_builds: 6