Always record uploaded pkg files as "apps" source if they have a bundle ID to avoid conflicts with the same package appearing in inventory later (#26374)

For #26373.

# Checklist for submitter

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- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files)
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- [x] A detailed QA plan exists on the associated ticket (if it isn't
there, work with the product group's QA engineer to add it)
- [x] Manual QA for all new/changed functionality

Autoated tests cover the code in the changes.

changes/26373-uploaded-pkg-source

@@ -0,0 +1 @@
+* Fixed a bug where uploading a macOS installer could prevent the software from being inventoried.

ee/server/service/software_installers.go

@@ -1409,11 +1409,15 @@ func (svc *Service) addMetadataToSoftwarePayload(ctx context.Context, payload *f
 		payload.UninstallScript = file.GetUninstallScript(meta.Extension)
 	}
 
-	source, err := fleet.SofwareInstallerSourceFromExtensionAndName(meta.Extension, meta.Name)
-	if err != nil {
-		return "", ctxerr.Wrap(ctx, err, "determining source from extension and name")
+	if payload.BundleIdentifier != "" {
+		payload.Source = "apps"
+	} else {
+		source, err := fleet.SofwareInstallerSourceFromExtensionAndName(meta.Extension, meta.Name)
+		if err != nil {
+			return "", ctxerr.Wrap(ctx, err, "determining source from extension and name")
+		}
+		payload.Source = source
 	}
-	payload.Source = source
 
 	platform, err := fleet.SofwareInstallerPlatformFromExtension(meta.Extension)
 	if err != nil {