fix: prevent deletion of all deployments with pending builds

[woustachemax]

Fixed an issue where attempting to delete all deployments (including those still building/processing) would result in 404 errors and orphaned functions.

Changes:

• Added validation to block deletion when all deployments are selected and any are in 'waiting', 'processing', or 'building' status
• Returns proper error message to display in UI instead of allowing the operation to proceed
• Maintains ability to delete all completed deployments (leaves function in clean "no deployments" state)
• Preserves error tracking for analytics

This prevents the edge case where deleting all deployments while builds are in progress would corrupt the function state.

Summary by CodeRabbit

• Bug Fixes
  • Prevented accidental deletion of all deployments when selected deployments are still processing or pending.