Reduce onboarding frequency

[SheepTester]

Info

Don't show onboarding when user has already attended events

People are regularly seeing onboarding reappear because their devices seem to regularly clear cookies (particularly on iOS). Since kickoff already happened, it's probably fine if onboarding doesn't show up as often anymore. And we don't want users to be numb to it when backend support finally arrives with tasks

Note that one consequence of this change is that a new user who clicks "maybe later" on onboarding will never see it again until backend support is implemented. i think that's probably fine for now

Changes

• In order for onboarding to appear, it now checks that the user has only attended at most one event (probably the event they just checked into) when they close the checkin modal

Type of Change

• Bug Fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• Logistics Change (A change to a README, description, or dev workflow setup like
  linting/formatting)
• Continuous Integration Change (Related to deployment steps or continuous integration
  workflows)
• Other: (Fill In)

Testing

I have tested that my changes fully resolve the linked issue ...

• locally on Desktop.
• on the live deployment preview on Desktop.
• on the live deployment preview on Mobile.
• I have added new Cypress tests that are passing.

Checklist

• I have performed a self-review of my own code.
• I have followed the style guidelines of this project.
• I have documented any new functions in /src/lib/* and commented hard to understand areas
  anywhere else.
• My changes produce no new warnings.

Screenshots

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Name	Status	Preview	Comments	Updated (UTC)
membership-portal-ui-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 21, 2024 2:20am
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