Temuulen Enkhee

Better error message when build using machine executor fails

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## What problem does this feature solve?: Currently, CircleCI CLI does not support machine executor in local jobs. Currently, it throws the following errors. It would be great to have...

There were some potentially breaking changes in cattrs == 23.2.0 https://catt.rs/en/v23.2.3/history.html#id4 Probably caused by these changes.

I am not sure if it is intended behaviour or not. Slack integration sends message with `as_user: true` based on the token, because it is not explicitly set to false....

[Slack integration] files.completeUploadExternal.initial_comment does not support mrkdwn format

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https://github.com/looker-open-source/actions/blob/f9a87a9b67758271b9144770be6017992c61d30f/src/actions/slack/utils.ts#L143 It looks like files.completeUploadExternal.initial_comment does not support mrkdwn format and the comment is showing up as plain text.