Add missing AWS_ROLE_ARN parameter in dev script for fleetshard-sync

[kovayur]

Description

This PR adds loading of AWS_ROLE_ARN in dev scripts.
AWS_ROLE_ARN stays in Parameter Store for now, which makes it unavailable from the dev scripts, because they are loading the configuration from Secrets Manager only.

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.

Test manual

TODO: Add manual testing efforts

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup OCM_OFFLINE_TOKEN=<ocm-offline-token> OCM_ENV=development
make verify lint binary test test/integration

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kovayur, porridge

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[openshift-ci]

New changes are detected. LGTM label has been removed.