codecov notification changes

- require the reporting of 5 builds to try and prevent Github actions + Jenkins race condition
 - don't report if there's no change

codecov.yml

@@ -1,5 +1,8 @@
 codecov:
   require_ci_to_pass: yes
+  notify:
+    after_n_builds: 5
+    wait_for_ci: yes
 
 coverage:
   precision: 2
@@ -22,7 +25,7 @@ parsers:
 comment:
   layout: "reach,diff,flags,tree"
   behavior: default
-  require_changes: no
+  require_changes: yes
 
 ignore:
   - "src/examples"