Fix pipeline slack calls

Description

Since upgrading and tweaking our pipelines, we see the following in pipeline builds that try to interact with Slack:

The message to slack still works, and the build isnt marked as a failure, so this isn't high risk at the moment. But should be cleaned up. I think we aren't supposed to set a baseurl when using a botuser. Start by playing with the global slack configuration settings we're setting, I think that's where the problem might be.

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Reason for Variance

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Release Notes

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User Impact Summary

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Assignee

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Reporter

Mike Youngstrom

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Story Points

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