ref(node): Remove vendored redis/ioredis instrumentation

Removes the dead OpenTelemetry redis and ioredis instrumentations (and their
shared semconv constants) from `@sentry/node`. The redis integration is provided
by the channel-based implementation in `@sentry/server-utils` (default since
#22501); the node `redisIntegration` wrapper and its `cache.ts` (plus the
`vendored/types.ts` it still imports) are kept.

Ref: #22346

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: andreiborza