Use ContextManager as workaround to mitigate GC issues in some Admin tests

[fangnx]

What

Some Admin module unit tests (e.g. test_list_consumer_group_offsets_api) finishes but after that the callback function (_make_consumer_group_offsets_result), running in the librdkafka's background, triggers garbage collection. When librdkafka detects that rd_kafka_destroy is invoked from its own thread (https://github.com/confluentinc/librdkafka/blob/616fb6e8074e82e0302f1c7d2896d7e577f8eb9b/src/rdkafka.c#L1115), it sends the ABORT signal

Using context manager as a workaround as it seems to help with cleaning up AdminClient object. To fix the root cause, we have to do a deeper investigation in librdkafka

Checklist

• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

References

JIRA: https://confluentinc.atlassian.net/browse/NONJAVACLI-4105

Test & Review

Open questions / Follow-ups

[confluent-cla-assistant]

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[sonarqube-confluent]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[Copilot]

Pull Request Overview

This PR introduces context manager usage for AdminClient instances in Admin API tests to address garbage collection issues. The changes wrap AdminClient instantiation in with statements, ensuring proper resource cleanup. Additionally, some long lines are reformatted for better readability.

• Wraps AdminClient instances in context managers using with statements
• Reformats long lines to improve code readability
• Applies changes across multiple test functions for consumer groups and SCRAM credentials

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