* refactor(java-version): extract adoptium HTTP logic from datasource class
Move getPageReleases and the Adoptium fetch logic out of the
JavaVersionDatasource class into a standalone adoptium.ts module.
This makes the code easier to test in isolation and decouples
Adoptium-specific logic from the datasource class.
No behavior change — customRegistrySupport remains false, and the
hardcoded adoptiumRegistryUrl replaces the previously injected
defaultRegistryUrl (which was always the same value).
* fix(java-version): remove unused adoptiumRegistryUrl import from test
* test(java-version): use partial helper in spec
* refactor(java-version): extract adoptium HTTP logic from datasource class
* fix(java-version): pass Adoptium schema to HTTP client
* test(java-version): move Adoptium test to module spec
* chore(ci): retrigger failed checks
Gregor Zeitlinger