Pass in new flag DEXOPT_GENERATE_APP_IMAGE to test cases

Test cases that expect an app image pass this flag down.

Bug: 72696798
Test: adb shell /data/nativetest64/installd_dexopt_test/installd_dexopt_test

(cherry picked from commit 4f1ad408)

Merged-In: I2845488bf3c3012d67120503219400cfcf7da716
Change-Id: I6fe947c7b6a5b47b06b484edc8ea69a366496931