e2e: Refactor the CatalogSource tests to reduce flakes (#2693)

* Refactor catalog source e2e tests to unique namespaces

Signed-off-by: perdasilva <[email protected]>

* e2e: Ensure the CatalogSource resource created in the global catalog test is deleted

Signed-off-by: timflannagan <[email protected]>

Co-authored-by: perdasilva <[email protected]>

Author: timflannagan