Port osbuild/images v0.33.0 with dot-notation to composer

Update the osbuild/images to the version which introduces "dot notation"
for distro release versions.

 - Replace all uses of distroregistry by distrofactory.
 - Delete local version of reporegistry and use the one from the
   osbuild/images.
 - Weldr: unify `createWeldrAPI()` and `createWeldrAPI2()` into a single
   `createTestWeldrAPI()` function`.
 - store/fixture: rework fixtures to allow overriding the host distro
   name and host architecture name. A cleanup function to restore the
   host distro and arch names is always part of the fixture struct.
 - Delete `distro_mock` package, since it is no longer used.
 - Bump the required version of osbuild to 98, because the OSCAP
   customization is using the 'compress_results' stage option, which is
   not available in older versions of osbuild.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

vendor/github.com/osbuild/images/pkg/manifest/empty.go

@@ -30,7 +30,7 @@ type ContentTest struct {
 // content sources.
 func NewContentTest(m *Manifest, name string, packageSets []rpmmd.PackageSet, containers []container.SourceSpec, commits []ostree.SourceSpec) *ContentTest {
 	pipeline := &ContentTest{
-		Base:        NewBase(m, name, nil),
+		Base:        NewBase(name, nil),
 		packageSets: packageSets,
 		containers:  containers,
 		commits:     commits,