Generate memorystore redis instance auth string via TF

[nitishkrishna]

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Description

We can now create memorystore redis instances with auth enabled via the TF provider.
However, we still have to manually run a gcloud command to get the auth string that is used to connect to this instance:
https://cloud.google.com/memorystore/docs/redis/managing-auth#getting_the_auth_string

If we get this auth_string as an output/data source of the instance resource, we can consume that without manual commands needed.

New or Affected Resource(s)

• google_redis_instance

Potential Terraform Configuration

data "google_redis_instance" "default" {
  name = "my-redis-instance"
}

data.google_redis_instance.default.auth_string

References

Auth enabled issue: #7459
Fixed in: GoogleCloudPlatform/magic-modules#4079

• b/175902105

[sethvargo]

We also need this in the Exposure Notifications project.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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