Prefect yaml triggers add description.

[jeanluciano]

Adds the description to automations from triggers specified in the prefect.yaml.

closes: #16655

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
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[codspeed-hq]

CodSpeed Performance Report

Merging #16944 will not alter performance

_{Comparing jean/oss-6107-propagate-trigger-descriptions-from-prefect-yaml (a423d44) with main (52c77b3)}

Summary

✅ 2 untouched benchmarks