SDKGenerator now utilizes the new build flags instead of the old beta=true field.
SDKGenerator now utilizes the new build flags instead of the old beta=true field.

Summary: SDKGenerator now utilizes the new build flags instead of the old beta=true field.

Test Plan:
Manual examination of the code output when running the generator.
Automated build tests that are already in place.

Reviewers: #dev_tools_team, zac-playfab

Reviewed By: #dev_tools_team, zac-playfab

Subscribers: zac-playfab

Maniphest Tasks: T857

Differential Revision: https://phab.playfabdev.com/D794

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