ci: Post a simple Slack message when 'notify-pipeline-failure' fails
What does this MR do and why?
In case we get an invalid block
error when posting the "broken master" notification, we're falling back to post a simpler notification to notify of the original notification failure.
This is mostly a work-around, as ideally we should solve the invalid block
error.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #384171 (closed)
Edited by Rémy Coutable