feat: update conditions for showing home banners

[alexnm]

After some discussions with Ed, I adjusted the logic for our 3 possible banners on the home page:

1. Welcome to UBB (only for workspaces that were created BEFORE Feb 1st)
2. Upsell Pro UBB (only for FREE workspaces created AFTER Feb 1st)
3. Convert to UBB (only for seat-based PRO workspaces)

In a few weeks, we can change the content of the welcome to ubb to a more generic welcome banner for the dashboard.

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Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Cannot read properties of null (reading 'insertedAt') TopBanner(src/app/pages/Dashboard/Content/route... View Issue

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