DEVX-2723: call confluent kafka cluster use before stack tear-down

[javabrett]

Description

https://confluentinc.atlassian.net/browse/DEVX-2723

What behavior does this PR change, and why?

Specifies --cluster ID when running confluent kafka acl delete during tear-down, to prevent attempt to delete ACL from the context cluster, should a cluster different from the demo cluster be selected when stop-cloud.sh is run.

Author Validation

Describe the validation already done, or needs to be done, by the PR submitter.

• [X] ccloud/ccloud-stack

Reviewer Tasks

Describe the tasks/validation that the PR submitter is requesting to be done by the reviewer.

[ybyzek]

Per Slack, instead of doing this PR, the fix could be to use the Kafka cluster ID identified

[javabrett]

Added two commits to:

• Address DEVX-2724 also, by adding --cluster to confluent connect delete calls during tear-down
• Added call to confluent kafka cluster use prior to teardown: good hygiene to ensure the correct cluster is selected prior to tear-down.