disable codecov status

it's unreliable, and we don't want to waste time with incorrect failed status checks

the links in the checks are the main value, not the pass/fail

.codecov.yml

@@ -6,7 +6,7 @@ coverage:
   status:
     project:
       default:
-        target: auto
+        target: "0%"
     patch:
       default:
-        target: 20%
+        target: "0%"