Helm chart build of todo-backend quickstart fails while following readme instructions

This follow-up Jira of original issue (described in https://issues.redhat.com/browse/JBEAP-22280) was created upon mutual agreement. The readme does not contain as much inaccuracies as it was in JBEAP-22280, but there is a critical one:

Run the Backend on OpenShift -> Build and Deploy the Backend on OpenShift with JBoss EAP S2I section:

1. --set build.ref=EAP_7.4.0.Final - this parameter value itself is not correct (it must be EAP_7.4.0.GA).

The incorrect build.ref value will fail a Helm Chart build, thus setting the issue priority as blocker.