feat(web): v3 dashboard opt-in widget

[ChmaraX]

What changed? Why was the change needed?

• adds v3 dashboard opt-in widget
• saves the opt-in state to Clerk user unsafe metadata

Related EE repo PR: https://github.com/novuhq/packages-enterprise/pull/238

[linear[bot]]

NV-4589 Implement opt-in prompt

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commit: 44ba7a9

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[github-actions[bot]]

LaunchDarkly flag references

:mag: 1 flag added or modified

Name	Key	Aliases found	Info
IS_NEW_DASHBOARD_ENABLED	IS_NEW_DASHBOARD_ENABLED