Revert "Include public GameManager unit tests in presubmit"

This reverts commit 62fbe39ad688e91991dd091ea337984124eeffa8.

Reason for revert: this module will fail in presubmit b/260071873
BUG: 260071873

Change-Id: Ic2d5637ddd451755c0f5bc1cfdd5dd5be67baa31
2 files changed