Fix EiffelEventParserIt#artcQueued

The intention was to test that no ArtC was created when the SCS for the
commit didn't exist already. But ArtC creation failed because CD/ArtC
cannot be created for a tag that doesn't exist regardless of whether
the corresponding SCS is created or not.

Also rename the test to reflect what it's testing.

Solves: Jira GER-1733
Change-Id: I4e25b3eb67d2bd895457277a2a3a39e3b45edf2f