What does this PR do?

Use unique group ID and topic names for the IBM/sarama tests.

Motivation

IBM/sarama test are flaking: example

Particularly seeing these logs:

    consumer_group_test.go:144: Message claimed: value = test 1, timestamp = 2025-01-10 14:09:58.608 +0000 UTC, topic = gotest
    consumer_group_test.go:144: Message claimed: value = value2, timestamp = 2025-01-10 14:09:59.652 +0000 UTC, topic = gotest

The second message seems to be produced by a different kafka test, so there is a chance the failed tests are caused by this extra unexpected message from a different test.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.
• For internal contributors, a matching PR should be created to the v2-dev branch and reviewed by @DataDog/apm-go.

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