Remove all mocks before generating them in CI

Author: qdm12

.github/workflows/ci.yml

@@ -86,6 +86,7 @@ jobs:
         shell: bash
       - name: Mocks are up to date
         run: |
+          grep -lr -E '^// Code generated by MockGen\. DO NOT EDIT\.$' . | xargs -r rm
           ./scripts/mock.gen.sh
           git diff --exit-code
       - run: ./scripts/build.sh evm