Update codecov coverage config file (#672)

- Properly set threshold.
- Try to avoid running extra test and upload
- Set thresholds to 1%.
- Set patch threshold to 5%.
- Use project flag only, disable "default"
- Rename the status of the project flag to optimade.
- Set fetch-depth to 2 for pytest job

.codecov.yml

@@ -1,14 +1,25 @@
 codecov:
   notify:
-    require_ci_to_pass: yes
+    wait_for_ci: yes
+  require_ci_to_pass: yes
 
 coverage:
   precision: 2
   round: down
   range: "70...100"
 
   status:
-    project: yes
-    patch: yes
-    changes: no
-    threshold: 1
+    project:
+      default: off
+      optimade:
+        threshold: 1%
+        flags:
+          - project
+      validator:
+        threshold: 1%
+        flags:
+          - validator
+    patch:
+      default:
+        threshold: 5%
+    changes: off

.github/workflows/deps_lint.yml

@@ -161,6 +161,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         submodules: true
+        fetch-depth: 2
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2