[9.0](backport #6966) Fix config used in Otel manager test #6993
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What does this PR do?
Otel collector exposes metrics on port 8888 by default, which can cause conflicts with other applications in tests. Disable this.
Use the debugexporter and nopreceiver in the test instead of the otlpexporter and otlpreceiver. This is faster and doesn't require binding to any ports as well.
Why is it important?
Tests should not be flaky.
Checklist
Related issues
This is an automatic backport of pull request #6966 done by [Mergify](https://mergify.com).