Remove fileService getFileStream fallback after completed migration

[Weiko]

To merge once the command has been executed.

[greptile-apps]

PR Summary

This PR removes the fallback mechanism in the getFileStream method of the FileService class, simplifying file retrieval from workspace-specific folders.

• Removed error handling and fallback logic in packages/twenty-server/src/engine/core-modules/file/services/file.service.ts
• Assumes all files have been migrated to workspace-specific folders
• Critical to ensure file migration is complete before merging to prevent access issues
• Simplifies getFileStream method by directly returning fileStorageService.read() result
• Potential impact on file accessibility if migration is incomplete

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[thomtrp]

Will let you merge once you ran the command