Add Rubocop to check for SSL verification setting on integrations

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Background

The following discussion from https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/2043 should be addressed:

• @alexkalderimis started a discussion:

  I understand why this is not part of BaseCI (for services like BuildKite) - but I feel we want assurance that new services get this as well.

  Can we perhaps add a rubocop rule such that:

  • for all CI integrations (only CI integrations?)
  • the class must prepend EnableSslVerification

  optional: only if a URL is declared

  This should be a follow-up

This would make sense for all integrations which can be self-hosted (e.g. Jira), not just CI integrations.