RedisInsight blocks startup

[davidfowl]

When testing #6135, I noticed that shutdown was hanging. On further investigation, I found that the redis insight logic blocks startup and retries 5 times until it succeeds https://github.com/dotnet/aspire/blob/fb53a555ce245c253c823e3a0032809a9b183bcb/src/Aspire.Hosting.Redis/RedisBuilderExtensions.cs#L175-L180. This shouldn't block startup and should instead use the "ResourceReadyEvent" to do make these requests.

[Alirexaa]

I will work on this.