Fix script name in analyzer.yml integration test

What does this MR do?

This MR fixes a bug introduced by Move jq logic to a script and improve functionality: the ./compare_reports.sh script was incorrectly referred to using ./compare_reports (without the .sh extension) in the integration test.

What are the relevant issue numbers?

gitlab-org/gitlab#214408 (closed)

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
  • https://gitlab.com/gitlab-org/security-products/analyzers/pmd-apex/-/jobs/525060720