docs: update Argo CD platform notes

[abdollahShahid]

Closes #1925

This updates the Argo CD platform notes to make the example and resource tracking guidance clearer.

Changes:

• Adds config.preserve: false to the complete example
• Moves webhookLabels under config.webhookLabels
• Updates the Argo CD resource tracking text for Argo CD v3
• Explains that webhook labels are optional for visibility and not required for Argo CD v3 resource tracking

Testing

• Ran Prettier on the changed docs file npx prettier --check src/content/docs/docs/installation/platform-notes.md
• Built the website locally npm run build

[Copilot]

Pull request overview

Updates the Argo CD platform notes documentation to reflect Argo CD v3 resource tracking behavior and to correct/clarify the recommended Kyverno Helm configuration when deploying via Argo CD.

Changes:

• Updates the “Complete Application Example” to set config.preserve: false and nests webhookLabels under config.webhookLabels.
• Revises “Resource Tracking and Ownership” guidance to describe Argo CD v3’s default annotation-based tracking and older label-based behavior.
• Clarifies that webhook labels are optional for visibility and not required for Argo CD v3 resource tracking.

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[Suhani95]

@abdollahShahid
One suggestion: since the distinction between Argo CD v2 (label-based tracking) and v3 (annotation-based tracking) is important, it may help to place the argocd-cm ConfigMap example inside a dedicated Note/Tip block so users skimming the docs don’t miss the version-specific guidance.