Fix version: AI 2.37.0

Documenting the new OpenShift Sandboxed Container (OSC) operator that now can be added via Assisted-Installer. See screen capture in comments below.

Add the OSC operator to the following sections:

• 1.2 - Customizing your installation
• 3.4 - Installing Operators (UI)
• 4.5.1 - Installing Operators (API)
• 4.6.1 - Updating Operators (API)

Contacts:

• SME: Xiangchun Fu
• QE: Elia Jashan

Test case from Elia:
https://docs.google.com/document/d/1upcUGm4YYJoY9mFuq3UgEk9dvCj3m4HFXorPdyz0ma4/edit?tab=t.0#heading=h.yb7i28nooju

Tech preview: The Operator is in technology preview so the appropriate disclaimer should be added as a snippet in sections 1.2, 3.4 and 4.5.1. 

More information:

• https://github.com/openshift/sandboxed-containers-operator
• https://docs.redhat.com/en/documentation/openshift_sandboxed_containers/1.8/html/user_guide/about-osc#osc-operator_about-osc 
• https://docs.redhat.com/en/documentation/openshift_sandboxed_containers/1.8 

The operator is not new - what's new is that it is supported in Assisted Installer.