Remove legacy messaging/db span attributes from AMQP & Redis instrumentations

[nicohrubec]

Remove the legacy messaging.* and db.* span attributes kept for back-compat in the tracing-channel AMQP and Redis instrumentations, switching to the current semantic-convention equivalents.

• sentry-javascript/packages/server-utils/src/integrations/tracing-channel/amqplib.ts

  Line 44 in 05d49a7

  // TODO(v11): remove these legacy attributes.

• sentry-javascript/packages/server-utils/src/integrations/tracing-channel/redis.ts

  Line 41 in 05d49a7

  // todo(v11): drop this — it is already covered by host and port.

• sentry-javascript/packages/server-utils/src/integrations/tracing-channel/ioredis.ts

  Line 27 in 05d49a7

  // todo(v11): Let's drop this as this is already covered with host and port

[linear-code]

JS-3086