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

[marko-lisica]

Related to:

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

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[marko-lisica]

Dev notes

• Add a packages array to the List software (GET /api/v1/fleet/software/titles) and Get software (GET /api/v1/fleet/software/titles/:id) responses. The array lists all packages added for a title.
  • GET /api/v1/fleet/software/titles: Don't include last_install and last_uninstall fields, as those are only relevant for the host.
• software_package is kept for backwards compatibility and it contains the oldest (first added) package.
• Per-package self_service, categories, and labels (labels_include_any, labels_exclude_any, labels_include_all.
• GET /api/v1/fleet/hosts/:id/software
  • Keep the software_package object in the response. If multiple packages are added to the software title, it will include info about the package that is installed/available for install for that host.
  • In case there are multiple packages that are in scope on the host, we rely on the fallback (the package that is first added).