Add comprehensive e2e test coverage for AI Catalog flows

Jannik Lehmannrequested to merge
jnnkl-e2e-flows into master

What does this MR do?

Adds comprehensive end-to-end (e2e) test coverage for Flows in the AI Catalog, mirroring the existing test suite for Agents.

Issue: #573010 (closed)

Test Coverage Added:

  • Flow creation (ai_catalog_flow_create_spec.rb)
  • Flow editing (ai_catalog_flow_update_spec.rb)
  • Flow list view (ai_catalog_flows_list_spec.rb)
  • Flow deletion (ai_catalog_flow_show_spec.rb)

These tests follow the same patterns and structure as the existing agent tests to ensure consistency.

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