[WEB-5598] refactor: streamline object creation in workspace seed task and improve error handling in workspace creation

[pablohashescobar]

Description

• correct created by in workspace seed data

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)

Test Scenarios

• create a new workspace and verify the created_by's for various entities

References

WEB-5598

Summary by CodeRabbit

• New Features
  • Bot user is now automatically added to workspaces during initialization.
  • Objects created during workspace setup now properly record their creator attribution.

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