TPT-4397: Refactor of integration tests for IAM RBAC

[mawilk90]

📝 Description

Refactor of test responsible for setting user role permissions as it was skipped by default

PUT /iam/users/{username}/role-permissions

✔️ How to Test

make TEST_CASE=test_set_user_role_permissions test-int

[Copilot]

Pull request overview

Adds SDK + tests around IAM “permissions” endpoints and refactors the RBAC integration test that sets user role permissions so it runs by default.

Changes:

• Add account_permissions_get and entity_permissions_get methods to IAMGroup.
• Add unit test coverage + fixtures for the new permissions endpoints.
• Refactor and expand IAM integration tests (including un-skipping user role-permission setting).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
linode_api4/groups/iam.py	Adds IAM permissions getter methods for account and entity scopes.
test/unit/groups/iam_test.py	Adds unit tests validating the new IAM permissions getters.
test/integration/models/iam/iam_test.py	Refactors RBAC role-permission setter test and adds integration coverage for permissions endpoints.
test/fixtures/iam_users_myusername_permissions_account.json	Fixture for account-level permissions response.
test/fixtures/iam_users_myusername_permissions_linode_1.json	Fixture for entity-level permissions response.

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