fix: allow usage exceeded alert to be dismissed

[xrdt]

Problem

Two changes:

1. Add a dismissKey to the usage exceeded alert banner. I think it's annoying to have it be persistent. 1a. Along with this change, tweaked the billingAlert onClose logic so the logic for showing the close button will work.
2. Tweaked the product intro margins so it doesn't sit flush against alerts.

https://github.com/PostHog/posthog/assets/21014901/cf525e64-e944-4df1-89b1-b37d50bb97e5

Changes

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Hey @xrdt! 👋 This pull request seems to contain no description. Please add useful context, rationale, and/or any other information that will help make sense of this change now and in the distant Mars-based future.

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Size Change: +42 B (0%)

Total Size: 864 kB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	864 kB	+42 B (0%)

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[raquelmsmith]

Does this hide it forever? What if they go over their limit the next month?

[xrdt]

That's a good point. I've updated it so we reset the dismissKey if the usageExceeded check is not triggered.

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