Fixed scope of RoleAssignment for storage accounts

[BrianVallelunga]

This PR closes #1038

The changes in this PR are as follows:

• In builder: role assignment is to the storage account, not the resource group
• Tests updated

I have read the contributing guidelines and have completed the following:

• [X] Tested my code end-to-end against a live Azure subscription.
• [X] Updated the documentation in the docs folder for the affected changes.
• [X] Written unit tests against the modified code that I have made.
• [X] Updated the release notes with a new entry for this PR.
• [X] Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

[BrianVallelunga]

I'm not sure why fantomas added the extra line breaks, but the code works.

EDIT: I had used an older version of fantomas. I restored the spacing.

[ninjarobot]

Thanks @BrianVallelunga, this is included in 1.7.23 and available on nuget.

[BrianVallelunga]

Great!