Describe the Issue:

1. According to the DO Dashboard, connection pools can have the user field (also known as User privileges override (Optional)) set to an empty string (which appears as N/A in the table shown on the Connection Pools tab for a Postgres database). The empty string corresponds to "Use inbound user" in the DO Dashboard.

2. The DO API Reference to "Add a New Connection Pool" shows:

• name, mode, size and db are required, but
• user is not required.

3. When using doctl databases pool create <database-cluster-id> <pool-name> --size 25 --db <a-database-name-that-exists-inside-database-cluster-id-provided> --mode transaction, I see an error message appear:

Error: (pool.create.user) command is missing required arguments

See "Additional Details" below for a possible fix.

Environment:

• doctl version: 1.142.0-release (Git commit hash: 4979b33d)
• OS: Ubuntu 20.04.4 LTS
• Installation method: Installed binary from tarball (https://github.com/digitalocean/doctl/releases/download/v1.142.0/doctl-1.142.0-linux-amd64.tar.gz)

Additional Details:

Since the --user arg is not marked as a requiredOpt() in