replace dependency of tagsInfo and repoInfo with just a list of manifests

- replace dependency of tagsInfo and repoInfo with a list of manifests, since it provides
all the needed data
- Mock tests added

Signed-off-by: Alex Stan <alexandrustan96@yahoo.ro>

pkg/test/mocks/oci_mock.go

@@ -23,10 +23,11 @@ type OciLayoutUtilsMock struct {
 	GetRepoLastUpdatedFn        func(repo string) (common.TagInfo, error)
 	GetExpandedRepoInfoFn       func(name string) (common.RepoInfo, error)
 	GetImageConfigInfoFn        func(repo string, manifestDigest godigest.Digest) (ispec.Image, error)
+	CheckManifestSignatureFn    func(name string, digest godigest.Digest) bool
 }
 
 func (olum OciLayoutUtilsMock) GetImageManifests(image string) ([]ispec.Descriptor, error) {
-	if olum.GetImageBlobManifestFn != nil {
+	if olum.GetImageManifestsFn != nil {
 		return olum.GetImageManifestsFn(image)
 	}
 
@@ -128,3 +129,11 @@ func (olum OciLayoutUtilsMock) GetImageConfigInfo(repo string, manifestDigest go
 
 	return ispec.Image{}, nil
 }
+
+func (olum OciLayoutUtilsMock) CheckManifestSignature(name string, digest godigest.Digest) bool {
+	if olum.CheckManifestSignatureFn != nil {
+		return olum.CheckManifestSignatureFn(name, digest)
+	}
+
+	return false
+}