chore: make the termination handler more robust

[kayman-mk]

Description

In case the agent is terminated, we search for child instances which are 'running', 'pending', 'stopping', 'stopped'. All ol them are terminated. Furthermore we retry the termination call 3 times in case of exceptions.

This fixes the problem that sometimes a small amount ol EC2 instances remain in stopped state.

Fixes parts of #1298

[github-actions]

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[github-actions]

🦙 MegaLinter status: ❌ ERROR

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[kayman-mk]

Not sure, why the linter fails ....