[Docs] Synchronize Infinispan 14 docs downstream

Docs only issue:

1. Set up 8.4.x branch in the https://gitlab.cee.redhat.com/red-hat-jboss-data-grid-documentation/rhdg-documentation
2. Double check upstream (GH actions) infinispan and infinispan-operator
3. Set up jobs the following for 8.4:
   8.4.x-dotnet-client-sync.groovy
   8.4.x-helm-chart-sync.groovy
   8.4.x-operator-doc-sync.groovy
   8.4.x-simple-tutorials.groovy
   8.4.x-cpp-client-sync.groovy
   8.4.x-doc-sync.groovy
   8.4.x-js-client-sync.groovy