fix(ci): remove the always failing amis workflow

[Neudrino]

Summary

• Remove always failing amis-workflow.
• Magma does not currently provide AMIs anymore anyway. They were all removed from AWS store as well.
• With containerized AGW the future necessity of AMIs is questionable.

[github-actions]

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[github-actions]

dp-workflow

0 tests   0 ✔️  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit 02aac0a.

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[LKreutzer]

Lgtm