Build Amplitude chart(s) to analyze campaigns

[thekaveman]

See more details in #2036

Acceptance Criteria

• [x] count of visits from each the banner
• [x] events the user triggered beginning at the app landing page
• [x] count of successful enrollments originating from banner
• [ ] Add the chart(s) to the Amplitude Benefits dashboard

Additional context

Depends on the work from #2034 being completed and released.

[thekaveman]

This chart should get us started: https://app.amplitude.com/analytics/compiler/chart/lhg1stku

It shows 2 counts, both grouped by utm_content (e.g. the specific banner like olderadults_EN)

• Total number of users visiting the app from a banner
• Total number of users that successfully enrolled after visiting via a banner

cc @indexing

[thekaveman]

@indexing and I met to talk about some additional reporting within Amplitude. We created 2 more charts:

• Transit App funnel, showing the conversion and drop-off at various stages of Benefits for users coming from TransitApp
• Benefits app journeys from Transit app showing all user journeys for all users coming from TransitApp

We agreed that this issue can now be closed.