tests: envtest: Add OperatorCondition CRD

Partial application of
261bbab ("cluster: GetPlatform: replace CSV list with OperatorExists calls (opendatahub-io#1051)")

Confused, the only usage came with an old patch
099c1a4 ("Add check on dependent operators")

Signed-off-by: Yauheni Kaliuta <[email protected]>