supabase / supabase / 26027637601

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chore(telemetry): clean up frontend event catalog (#45964)

## Summary
Resolves 13 findings (2 HIGH, 5 MEDIUM, 6 LOW) from the frontend
telemetry audit: 1 action-string collision, 1 camelCase experiment name,
9 dead events removed, 4 missing org groups attached, 1 ambiguous
property renamed, 1 raw-string property narrowed, plus consolidations
and a structural tightening on TABLE_EVENT_ACTIONS.

## Changes
### HIGH
- Rename `EventPageCtaClickedEvent.action` to
`www_event_page_cta_clicked` so it no longer collides with the pricing
CTA event (which had a different schema sharing the same action string)
- Snake_case the header-upgrade experiment exposure name
(`headerUpgradeCta_experiment_exposed` →
`header_upgrade_cta_experiment_exposed`); PostHog flag key and
`?source=` URL param unchanged

### MEDIUM
- Remove 4 dead `ProjectCreation*Step*` events (referenced a v2 route
that doesn't exist; 0 emissions)
- Remove 4 dead experiment exposure events:
`ProjectCreationRlsOptionExperimentExposed`, `HomeNewExperimentExposed`,
`TableCreateGeneratePoliciesExperimentExposed`,
`TableCreateGeneratePoliciesExperimentConverted` (0 emissions)
- Attach org group to `dpa_request_button_clicked` (0% had `$group_0`
per Hex)
- Delete `RegisterStateOfStartups2025NewsletterClicked` (interface
naming outlier, 0 emissions, page renamed to 2026)
- Rename `AssistantSuggestionRunQueryClickedEvent.category` to
`mutationType` with tightened literal union (`'functions' |
'rls-policies' | 'unknown'`)
- Attach org group to `project_creation_default_privileges_exposed` on
Vercel surface via explicit `groupOverrides` (auto-injection misses
because `useSelectedOrganizationQuery` is undefined on that page)

### LOW
- Consolidate `IndexAdvisorBannerEnableButtonClickedEvent` +
`IndexAdvisorDialogEnableButtonClickedEvent` into one event with
`origin: 'banner' | 'dialog'`
- Rename `ImportDataFileDroppedEvent` → `ImportDataFileAddedEvent` so
the interface name matches the action and the verb is ... (continued)

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