Remove usage of /api/aadapp/{id} endpoint in TDP

[aosolis]

Describe the bug
TTK is still using the api/aadapp/{id} endpoint in TDP. Please change to api/aadapp/v2/{id}.
https://github.com/OfficeDev/TeamsFx/blob/386ad86ad8bf0ecfc09ca50a238bb8c2c6b240a3/packages/tests/src/e2e/debug/utility.ts#L43

Additional context
We are about to remove the old endpoint, and TTK is the last remaining caller.

[microsoft-github-policy-service]

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