Remove stale concrete classes for interfaceOnlyTypes

[cmgrote]

Summary

• Removes 9 stale concrete asset classes and their 9 test classes — leftovers from the old ModelGeneratorV2 Java generator that were never cleaned up after the Pkl migration
• The Pkl-based JavaRenderer intentionally lists these types in interfaceOnlyTypes (generates only I*.java interfaces, never concrete classes), but the sync workflow preserves any file it has no generated replacement for, so these orphans survived every sync

Deleted concrete classes: BI, EventStore, NoSQL, ObjectStore, SaaS, AWS, Azure, Google, Incident

Why these are safe to delete

• No other file in the repo imports or extends any of them
• All child asset types (e.g. KafkaTopic implements IEventStore, PowerBIDashboard implements IBI) extend Asset directly and implement the I* interfaces — never these concrete classes
• AssetDeserializer falls back gracefully to IndistinctAsset for any typeName not found in the ClassGraph registry

What triggered this

The new catalogDatasetGuid attribute added to the Catalog supertype in atlanhq/models (GOVFOUN-212, commit 0e95aaa0cc) is correctly propagated to INoSQL, IEventStore, IObjectStore, ISaaS, and IBI interfaces, but the stale concrete classes don't implement the new getter — causing 5 compile errors in PR #2357 and every subsequent sync PR.

Deleting all 9 concrete classes and their tests prevents this class of breakage from recurring as supertypes evolve.

Relationship to PR #2357

Once this merges to main, PR #2357 (sync-models-20260324-175607) will need to be closed and retriggered from the models repo — its diff currently includes +4 modifications to the 5 now-deleted files.

Test plan

• No other file imports the deleted classes (verified via grep)
• ./gradlew assemble shadowJar passes
• ./gradlew test passes