fix(operator): skip PackageSource on empty URL, add comprehensive tests
Guard PackageSource creation on platformSourceURL != "" to avoid
dangling SourceRef when no Flux source resource exists.
Add tests covering all new and modified functions:
- parsePlatformSourceURL (OCI, HTTPS, SSH, empty, unsupported scheme)
- parseRefSpec (single/multi values, whitespace, equals in value,
missing equals, empty key/value, trailing comma)
- validateOCIRef / validateGitRef (valid keys, invalid keys, format)
- generateOCIRepository / generateGitRepository (with ref, no ref,
invalid ref)
- installPlatformPackageSource variant valuesFiles validation
- installPlatformPackageSource custom name
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>
4843a617bc