WIP:initial spec file to test restructured text rendering

What does this MR do?

This is an initial test to test restructured text rendering

This MR is for a test that creates a wiki push and verifies it renders correctly with the correct file extension.

What are the relevant issue numbers?

305 gitlab-qa#305 (moved)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer