### Overview In 16.0 we will be dropping support for ZAP customization variables reports that are configured via the environment variables: DAST_HTML_REPORT, DAST_XML_REPORT, and DAST_MARKDOWN_REPORT These reports are: 1. No longer valuable as authentication is completed via browser-based DAST 2. Browser based DAST is now running passive attacks 3. GitLab's vulnerability report and pipeline reports provide a single source of truth. To ensure a smooth transition, we should emit a deprecation notice when the DAST engine is called with any of these values set. "Use of the DAST_HTML_REPORT, DAST_XML_REPORT, and DAST_MARKDOWN_REPORT are deprecated and will no longer work in GitLab 16.0. You can view reports in the pipeline page in GitLab." * [x] Add deprecation notice to code * [x] Add conditional into DAST engine so that the values are ignored if DAST version is >=4. This way, when we bump the version, we do not need to immediately remove the code. * [x] @derekferguson publish deprecation notice