ITS: harmonize lighting check for night/HDR tests

Details: to ensure consistent behavior across extension tests, changed
behavior to first validate lighting and then load the scene.

Bug: 304337591
Test: tested locally and by partner
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6ed18bc93de06dd3d3e51586ddf75b85d008c6b1)
Merged-In: Ia324c1df1bcdf10d5d1d02db2070d1c3facc9515
Change-Id: Ia324c1df1bcdf10d5d1d02db2070d1c3facc9515