Backport of #6425 to release/9.0

/cc @mitchdenny

Customer Impact

Currently when a developer makes Redis Insight persistent using the following code:

var builder = DistributedApplication.CreateBuilder(args);
var redis = builder.AddRedis("redis").WithRedisInsight(c =>
{
  c.WithLifetime(ContainerLifetime.Persistent);
});

On subsequent runs RedisInsight will show additional instances of Redis (one for each launch of the apphost). This is because the import mechanism we use doesn't overwrite existing instances with the same name. This PR changes this logic so that we first pull the list of instances from RedisInsight and create the list of ones we want to delete, and then adds them back in via import).

The reason we delete is that the Redis instance may actually have changed credentials so we need to make sure the Redis instance has the correct credentials.

Testing

Manual testing and automated functional tests.

Risk

Low.

Regression?

Microsoft Reviewers: Open in CodeFlow