User role incorrect when calling StartImportTask

[acarbonetto]

Describe the bug

If the user role contains a subfolder, for example: arm:aws:iam:99999:role/sub-role/MyRole-RoleType the sub-role is excluded from the StartImportTask call.

To Reproduce

Steps to reproduce the behavior:
TBD

Expected behavior

The IAM Role should be passed as defined.

Screenshots

N/A

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.