When building CRW server, check that Che version expected aligns to Che version in the image

at the end of get-sources-jenkins.sh for teh CRW server build in Brew, we could enable a test that:

• gets the container (from :latest or the specific new tag)

• unpacks dashboard.war
• looks in ./assets/branding/product.json

  $➔ docker run -it --rm --entrypoint /bin/bash quay.io/crw/server-rhel8:2.1-22 -c "unzip -q -d /tmp/dashboard codeready/tomcat/webapps/dashboard.war assets/branding/product.json; grep productVersion /tmp/dashboard/assets/branding/product.json"
    "productVersion": "2.1.1.GA :: crw_master/1119 :: che-dev @ 9348 (19) :: che-parent @ 9654c (7.9.3) :: che @ 84e10 (7.9.3) :: codeready-workspaces @ 7676 (2.1.1.GA)",
  

• compares to expected value from [...?]
• if not the same, fail build immediately