[SNOW-3249917] JDBC removal Step 8c: Swap all imports, replace upload path

[sfc-gh-ggeng]

Summary

The big-bang step: swap all JDBC imports to ingest versions and replace the non-Iceberg upload path.

InternalStage is now completely free of JDBC imports.

Changes

• InternalStage: swap all 6 JDBC imports to ingest versions, replace getFileTransferMetadatas and uploadWithoutConnection calls, remove parseConfigureResponseMapper Jackson workaround
• InternalStageManager: swap SnowflakeSQLException
• SnowflakeFileTransferMetadataWithAge: swap SnowflakeFileTransferMetadataV1
• All fileTransferAgent files: remove JDBC imports (now same-package)
• Replicated SnowflakeFileTransferAgent: remove CommandType bridge, use ingest types directly
• InternalStageTest: update imports, remove JDBC upload verification (PowerMock tests already broken with JDK17)

JDBC imports remaining (for Steps 9a-9c)

• SFSession in replicated SnowflakeFileTransferAgent (always null)
• SFException in SnowflakeSQLException (unused constructor)
• 12 imports in SnowflakeSQLLoggedException (telemetry)
• 6 imports in TelemetryClient (session path)
• ObjectMapperFactory and SecretDetector in telemetry classes

Stacked on #1121.

Test plan

• mvn compiler:compile passes
• mvn test-compile passes
• ./format.sh passes
• FlushServiceTest — 30 tests pass
• Full IT suite

🤖 Generated with Claude Code

[sfc-gh-ggeng]

Reverted — cannot swap types in InternalStage while the non-Iceberg upload path still uses JDBC's SnowflakeFileTransferConfig/SnowflakeStorageClient. Need to replicate the full JDBC storage stack first, then swap everything at once.