QUARKUS-1153 - code.quarkus.redhat.com - allow user select a version

JIRA link: https://issues.redhat.com/browse/QUARKUS-1153

Allow user to select version of Red Hat build of Quarkus using code.quarkus.redhat.com

It's not intended to provide a selection of concrete versions, but to provide the one supported in the stream.

Scope of testing

Exploratory testing of code.quarkus
Test development for automated checks

Getting familiar with the feature

Exploratory testing of code.quarkus
Generating applications from different streams
- expected to have 2.2 and 2.7 streams

Automated test development

Test development in quarkus-startstop test-suite to ensure stream selection option is available.
Automated test development to ensure 2 streams are available is under consideration.
- 2 streams are guaranteed only for certain time (2 months), see https://access.redhat.com/support/policy/updates/jboss_notes#p_quarkus

Impact on test suites and test environment

Both upstream integration tests and planned