[YAML] Add multiple custom packages for the same software title in the same fleet

[marko-lisica]

Related:

• Add multiple custom packages for the same software title in the same fleet #28108

Documents the GitOps YAML changes for supporting multiple custom packages on the same software title in the same fleet.

• Adds a Multiple versions of the same software section under software.packages, showing how a single packages entry can point at a package YAML file that lists more than one package (e.g. for a staged rollout or architecture targeting).
• Clarifies that self_service, categories, and labels are defined per package inside the package YAML file, not on the fleet-level YAML file.

[claude]

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