fix: allow assumeRoleAction to be set

[RichardoC]

Issue #31128

Closes #31128

Reason for this change

This is required for using OIDC to assume an AWS role, this should be sts:AssumeRoleWithWebIdentity in this case

Description of changes

Default assumeRoleAction to 'sts:AssumeRole' for backwards compatibility, but allow it to be overridden if needed

Description of how you validated changes

Added custom assumeRoleAction to 'can use all role properties'

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

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• Commit ID: 9077fdd
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[RichardoC]

Not needed, can be done via #31128 (comment)

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