The new test_distro's manifest produces a slightly different empty
manifest when serialized even without content. Cloud API and Koji tests
have been adapted to match.
Weldr tests have been updated in several ways:
- The test_distro content resolver is used to resolve manifest content
before serializing.
- The test scenarios in TestCompose have been named for easier
troubleshooting (easier to identify a failing test by name).
- Manifests that work with the secondary ostree repo (the "other") use
the appropriate URL and ref and create a secondary "other" serialized
manifest.
The weldr API's test flag for resolving ostree commits does not produce
the same, fixed hash every time but instead computes a sha256 from the
URL + ref, like we do in the test manifests.
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