fix(cli): more robust handling of multiple deletions

[grs]

User Story

As an OpenShell CLI user deleting multiple resources (sandboxes, providers or provider profiles) in a single invocation, I want the CLI to handle and notify me of any error deleting one of the resources, but to continue iterating over the list.

Problem Statement

At present the first error on deletion stops iteration over the resources to be deleted. This means deletion of any remaining resources requires invoking the command again with a shortened list.

Impact / Why This Matters

This is a minor usability issue, but handling it well makes scripts and interactive use less arduous.

Acceptance Criteria

• deletion of a list of resources where one or more is invalid should still delete all those that are valid
• experience should be consistent across sandboxes, providers and provider profiles

Reproduction Steps

• attempt to delete a number of resources, with one invalid name in the middle of the list
• observe that after failing on the invalid item, deletion of subsequent items is not attempted

Environment

N/A

Logs