feat(o11y)add-sentry

[smeubank]

Adds a fast Sentry MVP to Realtime by wiring backend error reporting with request context and lightweight operational captures, while keeping tracing on the existing OpenTelemetry path.

Configuration is env-driven (SENTRY_DSN, SENTRY_ENVIRONMENT, SENTRY_RELEASE) with initial sampling and basic sensitive-data redaction to make early rollout safer.

###Test Plan

• Trigger a controller error and confirm event appears in Sentry with request context.
• Send a malformed websocket payload and confirm grouped channel error capture.
• Enable OTEL exporter and verify trace generation for /healthcheck.
• start with a very low sample rate

What kind of change does this PR introduce?

feature

What is the current behavior?

no sentry integration

What is the new behavior?

sentry integration

Additional context

based on docs for elixir with phoenix

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