Removes the deprecated `subscriptions-transport-ws` package (Renovate dependency dashboard #49).
The package is unmaintained and was only reachable through the Apollo `WebSocketLink` in `app/plugins/apollo.ts`. The schema has no `Subscription` type and no subscription operations are defined, so the ws `split()` branch was dead code.
- Drop `WebSocketLink`, the `split()` routing, `getMainDefinition`, and `wsUrl` from `app/plugins/apollo.ts`
- Remove the direct `subscriptions-transport-ws` dependency
Verified with `npm run build` (green) and eslint (clean).
Note: the package lingers in the lockfile as an optional peer dep of `@apollo/client` v3; it disappears with the Apollo Client v4 upgrade, which removes `@apollo/client/link/ws` entirely.
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Reviewed-on: #2922
argoyle
adf0cc4ac6