Fix :wiki_can_not_be_created_total counter

What does this MR do?

wiki_can_not_be_created_total counter was not incremented when it was expected.
It is fixed now.
Also, expanded the spec to check it.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• [-] Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content