chore: updating aws-iso-b partition to use node18x

[alvazjor]

Issue # (if applicable)

Closes #.

Reason for this change

NodeJs22.x version is not yet available in all regions for aws-iso-b partition. Until it is, we need to keep NodeJs18.x as the latest version.

Description of changes

Modified LATEST_NODE_RUNTIME_MAP in fact-table to map aws-iso-b partition to NodeJs18.x version. And updates all required unit and integration tests.

Describe any new or updated permissions being added

NA

Description of how you validated changes

Integ and unit tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[mrgrain]

Could you move it to Node 20?

[alvazjor]

@mrgrain Node20 is also not available in FFZ region

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[mergify]

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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