Adopt current generation instance types for Acceptance Testing

[breathingdust]

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Description

The current acceptance testing framework defaults to requesting m1 instance types for testing. This instance type is several generations old and in some cases tests are failing due to insufficient capacity of those types.

We should move to a more modern generation of instance types by default to improve stability of the tests and reduce costs of the suite.

Consider using Graviton types where possible as these tend to be the least expensive.

Related:

• Linter: Add acceptance test hardcoded instance type lint #23101
• Setup Region/Partition Agnostic aws_instance Acceptance Testing #4987
• tests/resource/aws_spot_instance_request: Replace m1.small Instance Type #15160

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