(workflows): update rollback context types

[vaishnav-mk]

Adds ctx: WorkflowStepContext to WorkflowRollbackContext and removes legacy stepName. Updates generated type snapshots and RPC type tests.

[ask-bonk]

All snapshots are consistent with the source definition. The changes are straightforward and correct:

1. stepName: string removed from WorkflowRollbackContext
2. ctx: WorkflowStepContext added to WorkflowRollbackContext
3. Generated snapshots updated consistently
4. Type tests updated to verify the new shape

The WorkflowStepContext type already contains step.name (as part of step: { name: string; count: number }) along with attempt and config, so users still have access to the step name via ctx.step.name - strictly more information than the old stepName string. The type tests cover both overloads of workflowStep.do().

This is a clean, well-scoped type change with no issues.

LGTM

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