TELCODOCS-1692 RN - 4.14: CNF-10471 Manage impact to GitOps ZTP from AgentClusterInstall field deprecation for SiteConfig

[slovern]

Version(s): 4.14

Issue: https://issues.redhat.com/browse/TELCODOCS-1692

Link to docs preview: https://76795--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-14-release-notes.html#ocp-4-14-ztp-siteconfig-deprecation

QE review:

• [x] QE has approved this change.

Additional information:

This change is subject to Change Management.

Change Management Approvals:

• [x] Product Experience: Edu Alcaniz @ealcaniz
• [x] QE: Periyamaruthu Mohanraj
• [x] Engineering: Ian Miller @imiller0
• [ ] Engineering PM: Hari Rakotoranto
• [x] DPM: Sheldon @tradej
• [x] Content Strategist: Donagh Brennan @DonaghBR