ci: reduce time running codecov

The codecov action is performing unecessary operations.
It runs by default some plugins that are having the side effect of generating
and extra coverage report.
This takes 1 minute (sometimes 2!) _per CI run_.

These changes disable those plugins. So it action should only search for the
existing XML report and upload it.

.github/actions/artifacts/action.yml

@@ -24,4 +24,5 @@ runs:
         flags: ${{ inputs.type }}
         files: ${{ inputs.files }}
         verbose: true
+        plugin: "noop"
       continue-on-error: true