hoist up package relationship discovery to analysis stage

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

internal/formats/syftjson/test-fixtures/snapshot/TestDirectoryPresenter.golden

@@ -1,7 +1,7 @@
 {
  "artifacts": [
   {
-   "id": "14696638697550896878",
+   "id": "cbf4f3077fc7deee",
    "name": "package-1",
    "version": "1.0.1",
    "type": "python",
@@ -36,7 +36,7 @@
    }
   },
   {
-   "id": "1889729387356865209",
+   "id": "1a39aadd9705c2b9",
    "name": "package-2",
    "version": "2.0.1",
    "type": "deb",

internal/formats/syftjson/test-fixtures/snapshot/TestImagePresenter.golden

@@ -1,7 +1,7 @@
 {
  "artifacts": [
   {
-   "id": "15119766234833480967",
+   "id": "d1d433485a31ed07",
    "name": "package-1",
    "version": "1.0.1",
    "type": "python",
@@ -32,7 +32,7 @@
    }
   },
   {
-   "id": "3293866126252599174",
+   "id": "2db629ca48fa6786",
    "name": "package-2",
    "version": "2.0.1",
    "type": "deb",

internal/formats/syftjson/to_format_model.go

@@ -25,7 +25,7 @@ func ToFormatModel(s sbom.SBOM, applicationConfig interface{}) model.Document {
 
 	return model.Document{
 		Artifacts:             toPackageModels(s.Artifacts.PackageCatalog),
-		ArtifactRelationships: toRelationshipModel(pkg.NewRelationships(s.Artifacts.PackageCatalog)),
+		ArtifactRelationships: toRelationshipModel(s.Relationships),
 		Source:                src,
 		Distro:                toDistroModel(s.Artifacts.Distro),
 		Descriptor: model.Descriptor{

internal/presenter/poweruser/test-fixtures/snapshot/TestJSONPresenter.golden

@@ -72,7 +72,7 @@
  ],
  "artifacts": [
   {
-   "id": "13280550215267739407",
+   "id": "b84dfe0eb2c5670f",
    "name": "package-1",
    "version": "1.0.1",
    "type": "python",
@@ -102,7 +102,7 @@
    }
   },
   {
-   "id": "7356949319602771519",
+   "id": "6619226d6979963f",
    "name": "package-2",
    "version": "2.0.1",
    "type": "deb",