SOLR-17567: Fix auth issue in stream tests

[malliaridis]

https://issues.apache.org/jira/browse/SOLR-17567

Description

In #2479 an issue was introduced together with the stream tests that cause the bats tests to fail.

Solution

This PR applies a fix that is used in test_basic_auth.bats for enabling authentication. Bats tests are not starting with a clean state sometimes, and this is one situation that is affected by that.

Tests

A test for missing credentials was added. CLI output could be improved but is not task of this fix / PR.

Checklist

Please review the following and check all that apply:

• I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• I have created a Jira issue and added the issue ID to my pull request title.
• I have given Solr maintainers access to contribute to my PR branch. (optional but recommended, not available for branches on forks living under an organisation)
• I have developed this patch against the main branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Reference Guide

[malliaridis]

@epugh this one can be merged into #2872 as well. I think it's better to include them all together in one merge. :)

[epugh]

LGTM.