Better error messages for misconfigured Beam worker
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improvement
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Description
If the Beam portable worker is misconfigured, error messages are usually just generic "Connection refused"-type messages that aren't actionable unless the user knows about Beam internals (which they shouldn't have to).
Imported from Jira [BEAM-12902](https://issues.apache.org/jira/browse/BEAM-12902). Original Jira may contain additional context.
Reported by: ibzib.
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