Doc updates for 5.10

[jeremydmiller]

• Add something to GCP docs for: PubSub: Allow to connect to an existing subscription #2015
• Add docs on Domain Events w/ EF Core, use Jeremy's blog post: https://jeremydmiller.com/2025/12/04/classic-net-domain-events-with-wolverine-and-ef-core/
• Add content on the HTTP transport
• Update Redis transport based on Implement Redis transport scheduling for messages #2003
• Add a note for this Add global timeout option for remote invocation #2038

[jeremydmiller]

I'm declaring success