Make IAMv3 policy Resources field NOOP

[kobajagi]

Description

Makes IAMv3 Policy Resources field noop. More details in the attached story.

Checklist

(For exoscale contributors)

• [x] Changelog updated (under Unreleased block)
• [x] For a new resource or new attributes: test added/updated

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #81933: egoscale/tf-provider: make iam(v3) policy resources field noop.