Fix incorrect instrumentation test results being pulled (DEV) (#2222)

* Copy directly from main bucket folder

* Setup BUCKETDIR as bash environment variable to persist across consoles.

* Don't reevaluate the bucket dir on each console spawn.
Fail job if gsutil fails.

* Specify sub-folder

Co-authored-by: Mohamed Metwalli <Mohamed.Metwalli@sap.com>