Add further tests of cyclical project imports

[philderbeast]

While reviewing #9578, I saw that the cyclical test didn't assertOutputContains and had but one cyclical test, a simple loopback of a project importing itself. It now has the following test projects;

+-- cyclical-0-self.project (imports cyclical-0-self.project)
+-- cyclical-0-self.project (already processed)
+-- etc

+-- cyclical-1-out-back.project
 +-- cyclical-1-out-back.config (imports cyclical-1-out-back.project)
+-- cyclical-1-out-back.project (already processed)
 +-- etc

+-- cyclical-1-out-self.project
 +-- cyclical-1-out-self.config (imports cyclical-1-out-self.config)
 +-- cyclical-1-out-self.config (already processed)
 +-- etc

+-- cyclical-2-out-out-backback.project
 +-- cyclical-2-out-out-backback-a.config
  +-- cyclical-2-out-out-backback-b.config (imports cyclical-2-out-out-backback.project)
+-- cyclical-2-out-out-backback.project (already processed)
 +-- etc

+-- cyclical-2-out-out-back.project
+-- cyclical-2-out-out-back-a.config
 +-- cyclical-2-out-out-back-b.config (imports cyclical-2-out-out-back-a.config)
+-- cyclical-2-out-out-back-a.config (already processed)
 +-- etc

+-- cyclical-2-out-out-self.project
 +-- cyclical-2-out-out-self-a.config
  +-- cyclical-2-out-out-self-b.config (imports cyclical-2-out-out-self-b.config)
  +-- cyclical-2-out-out-self-b.config (already processed)
  +-- etc

• Patches conform to the coding conventions.

[philderbeast]

Thanks @geekosaur, I've added newlines where they were missing in all files.

[philderbeast]

@Mikolaj if this gets approval, could we waive the 2 day delay please? It expands tests, tests that would help with #9578.

[Mikolaj]

Agreed, let's expedite this PR.

[Mikolaj]

@philderbeast: please kindly rebase/squash/redo commits as you see fit and please set the labels, including the delay_passed label.

[philderbeast]

Thanks @Mikolaj. I've squashed down to two commits, one that adds assertOutputContains to make the existing test more robust and another for adding the additional tests.

[philderbeast]

Label merge+no rebase is necessary when the pull request is from an organisation.