[Test] Fix Python version in kitchen tests related to AWS Batch and CFN Boostrap scripts. In particular, we expect all Oses to use Python 3.12.8, except for AL2 which uses 3.9.20.

[gmarciani]

Description of changes

In #2869 we upgrade Phython from version 3.9.20 to 3.12.8 for all OSes but AL2. The current PR reflects this expectation into tests related to AWS Batch and CFN Bootstrap scripts.

Tests

ONGOING

References

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