* Revert using a DEVFILE_PROXY env var
There is no proxy deployed in the internal test cluster.
As such, this env var no longer makes sense.
* To help troubleshoot, display the resolved Devfile registry URL
* Make interactive tests more resilient with stack versions
They are now able to determine if the "Select version" prompt
should be asked by "odo init" or not:
* Make sure doc automation tests do not rely on hard-coded namespaces
* Allow to run doc automation tests with more parallel Ginkgo nodes
This is possible now that those tests no longer
depend on a single hard-coded namespace.
* Remove occurrences of the DEVFILE_REGISTRY env var in IBM Pipelines scripts
* Reuse logic for determining the Devfile Registry URL in "odo registry" tests
* Clarify what openshiftci-config.sh is used for
