Update create issue e2e specs
What does this MR do?
Cleans up items from code reviews on !52256 (comment 494719374) and !52391 (comment 495620950) .
- Separates custom issue template e2e spec from create issue spec to improve parallelization.
- Removes redundant
:reliable
tag from create issue spec. - Removes redundant random strings from project names.
Edited by Désirée Chevalier