[HR Import] Generalize Workflows page for any HR connection [F11]

[francoisl]

• Part of project Integrate with merge.dev to adopt widespread HR import
• Parent issue (internal)
• Design doc

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Task

Update the Workflows page so the Gusto-specific logic introduced by the Gusto project works for any connected HR provider.

Files:

• src/pages/workspace/workflows/WorkspaceWorkflowsPage.tsx — swap isGustoConnected for isAnyHRConnected; swap gustoMode for the per-provider mode returned by getHRApprovalMode(policy, connectionName). The "Configure via {{provider}}" link routes back to the HR page.
• src/pages/workspace/workflows/approvals/WorkspaceWorkflowsApprovalsEditPage.tsx and WorkspaceWorkflowsApprovalsCreatePage.tsx — swap Gusto-specific guards for isAnyHRReadOnlyWorkflowMode(policy).
• Approval chain rows should show a "from {provider}" tag.

Dependencies: F1, F3, F4.

Issue Owner

Current Issue Owner: @bernhardoj