ui: show message while workflow is being orchestrated

Ayush Sharmarequested to merge
ayushHardeniya/debusine:ui-workflow-orchestrating-message into devel

Large workflows can take a long time to orchestrate, during which the UI may appear idle.

This change shows a simple informational message when a workflow is still being orchestrated, so users understand that processing is ongoing.

No backend behavior is changed.

Closes #1249 (closed)

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