fix(dashboard,web): opt-in page flickering; login/logout redirect

[ChmaraX]

What changed? Why was the change needed?

• fixes a temporary flick of legacy workflows page when redirecting to new dashboard
• redirect for opt-in users will happen on any domain where the legacy web is deployed

Fixes: NV-4838, NV-4825

[linear[bot]]

NV-4838 🐛 Opt-in state not persisted after logout

NV-4825 🐛 Switching back to the new Dashboard shouldn't show old workflows page momentarily

[netlify[bot]]

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