Fix flakey cli options test

What does this MR do?

Since !352 (merged) the reports generated by ZAP are no longer deterministic and intermittently fail with

@@ -160,7 +160,7 @@


             <tr bgcolor="#e8e8e8">
-                <td width="20%" class="indent1">URL</td><td width="80%">http://nginx</td>
+                <td width="20%" class="indent1">URL</td><td width="80%">http://nginx/sitemap.xml</td>
             </tr>

             <tr bgcolor="#e8e8e8">
@@ -170,7 +170,7 @@


             <tr bgcolor="#e8e8e8">
-                <td width="20%" class="indent1">URL</td><td width="80%">http://nginx/sitemap.xml</td>
+                <td width="20%" class="indent1">URL</td><td width="80%">http://nginx</td>
             </tr>

             <tr bgcolor="#e8e8e8">
FAILURE \u2717

This MR deals with that issue by only asserting that a single line exists in the generated report.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer