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feat(telemetry): mirror org_count to PostHog person property (#45946)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Feature + two follow-on fixes — small, scoped to telemetry / experiment
plumbing.

## What is the current behavior?

PostHog feature flags evaluated in Studio only have access to the
`gotrue_id` person property (set in `useTelemetryIdentify`) and the
`organization`/`project` group associations from pageviews. Flags can't
target users by org membership without a behavioral cohort, which
refreshes on a ~hourly schedule and lags behind real-time signup state.

This is blocking the rollout of the `dataApiRevokeOnCreateDefault`
experiment ahead of the May 30 default-privileges breaking change — we
need to target brand-new dashboard signups with no prior org membership,
and there's no person property to filter on.

## What is the new behavior?

Three changes, scoped tightly to make experiment targeting reliable for
brand-new signups:

### 1. Mirror `org_count` to a PostHog person property
(`apps/studio/lib/telemetry.tsx`)

The Studio `Telemetry` component now mirrors the user's current org-list
length to a PostHog person property `org_count` via
`posthog.identify(user.id, { org_count })`. The effect:

- Subscribes to `useOrganizationsQuery` (shares the same React Query
cache as `useSelectedOrganizationQuery`, so no extra network requests).
- Dedupes via a ref keyed on `{ userId, orgCount }` so we only call
identify when the value actually changes — handles user-switch
(logout/login as different user with same count) correctly.
- Generic enough to be useful beyond this experiment — analytics
segmentation by org membership, future flags that depend on multi-org
behavior, etc.

### 2. Merge pre-init identify properties
(`packages/common/posthog-client.ts`)

The previous `pendingIdentification` slot was a single-write buffer —
call... (continued)

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