feat: add publish and workflow feedback triggers

[bookwormsuf]

Problem

Part 4 of admin satisfaction rating split (see #9683, #9684, #9688). Adds two new trigger points that tell the zustand feedback store when a user has done enough work to warrant a satisfaction prompt.

Solution

Two trigger points call setEligible() on the admin feedback store:

1. Publish trigger — when a form goes public (storage or MRF mode), the settings mutation marks the user as eligible for the 'publish' feedback prompt.
2. Workflow trigger — when creating or updating a workflow step, if 2+ steps are "completed" (have fields assigned + respondent configured), marks the user eligible for the 'workflow' feedback prompt.

An isStepCompleted utility determines whether a workflow step has all required fields based on its WorkflowType (Static/Dynamic/Conditional). 4 unit tests cover one per workflow type + the empty-edit guard.

Breaking Changes

No — backwards compatible. Trigger points are gated behind the 5star-admin-rating feature flag (PR 1).

Tests

TC1: Publish triggers feedback

• Enable feature flag: window._growthbook.setForcedFeatures(new Map([['5star-admin-rating', true]]))
• Open a storage-mode form, click Publish
• Verify feedback modal appears

TC2: Workflow triggers feedback

• Enable feature flag
• Open an MRF form, add 2 workflow steps with fields + respondents configured
• Verify feedback modal appears after the 2nd completed step

TC3: Incomplete workflow does not trigger

• Enable feature flag
• Add 1 complete workflow step and 1 incomplete step (no fields assigned)
• Verify no feedback modal

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