Issue #3583190: replace hook_domain_load with storage-level alias resolution

Frank Mablyrequested to merge
issue/domain-3583190:3583190-domainalias-cached-domain into 3.x

Replace the fragile hook_domain_load (which only fires for fresh entity loads, not static cache hits) with alias resolution built into the storage layer via DomainAliasAwareDomainStorage.

The new storage class:

  • Overrides loadMultiple() to apply alias resolution to all returned entities (cached or fresh)
  • Writes resolved entities back to static cache (one-time cost)
  • Falls back to sibling domains sharing the same canonical hostname when a domain has no alias of its own (path-prefix inheritance)
  • Uses a recursion guard to prevent infinite loops from internal loadByProperties() calls

Also removes the resetCache() workaround from the existing test and adds a new test for cross-host alias resolution via sibling fallback.

Closes #3583190

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