CI: Check if namespace exists

Job #216832 failed for f5a3458e:

Error from server (AlreadyExists): namespaces "nc188" already exists

created branch 1037-ci-check-if-namespace-exists to address this issue

mentioned in commit cb58c6d4

mentioned in merge request !189 (merged)

mentioned in commit abbfb35d

changed milestone to %0.8.2

added QA label

assigned to @varac

mentioned in commit 7ff81dc2

closed with commit abbfb35d