fix(ec2): use MachineImage.latestAmazonLinux2 instead of MachineImage.latestAmazonLinux in ec2.BastionHostLinux

[nokok]

Closes #25310

We do not know the useful default values, but the purpose is achieved by replacing the API to be used as indicated by the warning.

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[gitpod-io]

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[nokok]

Clarification Request

Tests are currently failing (integration tests). I have fixed the unit test but I need help as I am not sure if it is correct to fix it this way.

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