Update hardcoded image to non-hardcoded one in upgrade test

[rhmkrutov]

Problem: x86-only image is hardcoded here:

activemq-artemis-operator-test-suite/test/smoke/basic/basic_update_test.go

Line 13 in d9f278b

CustomImage = "registry.redhat.io/amq7/amq-broker-rhel8@sha256:c5f4c08e068b9721967cf7c7cbd9a9e93fb5e39b264dd13b653e99d8f3fa9e0e"

solution:

a ) parse operator.yaml and extract relevant version for your architecture from it

b) add parameter to specify other image