Add acceptance tests for namespace in path pages implementation

What does this MR do?

Add acceptance tests for namespace in path pages implementation. This is in continuation with this MR: !1001 (merged)

Note: I have edited/copied the existing tests to test namespace-in-path flag. I have not changed actual behaviour of any tests.

Related: #1111 (closed)

Changelog: added

TODO

• Feature flag
  • Added feature flag:
  • This feature does not require a feature flag
• I added the Changelog trailer to the commits that need to be included in the changelog (e.g. Changelog: added)
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines