Replaced static email in branchpolicy tests

[tmeckel]

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• Have you added an explanation of what your changes do and why you'd like us to include them?
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open PRs for the same update/change?

What about the current behavior has changed?

Replaced static email with using AZDO_TEST_AAD_USER_EMAIL in azuredevops/internal/acceptancetests/resource_branchpolicy_test.go

Issue Number: N/A

Does this introduce a change to go.mod, go.sum or vendor/?

• Yes
• No

Does this introduce a breaking change?

• Yes
• No

Any relevant logs, error output, etc?

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Other information