Move more billing tests that require permissions beyond Billing User to master billing account

[modular-magician]

These were missed in GoogleCloudPlatform/magic-modules#7263 and GoogleCloudPlatform/magic-modules#7337. In short, the tests fail with a billing account that only has Billing User permissions, so we need to move them to using the "master" account. Hopefully this is the last set of these changes.

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Derived from GoogleCloudPlatform/magic-modules#7344

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