[9.0](backport #44188) [Flaky test] Give test filebeat receivers distinct home directories #44191
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fbreceiver.TestMultipleReceiverscreated two Filebeat receivers using the same config, which meant they both had the same home directory. This can cause conflicts that prevent a beat from starting, which is likely the cause of this test's recent flakiness. This PR wraps the config in a helper function so the two receivers get different temporary directories.This is an automatic backport of pull request #44188 done by [Mergify](https://mergify.com).