Add the flag to control cloud compilation verification in Package Manager.

Adding the cloud_compilation_verification flag to be read in the Package
Manager. This will guard the verification logic for cloud compilation
artifacts (in sdm file) and will be used to prevent the sdm file from
being installed if the verification fails.

Bug: 377474232 
Change-Id: If16914c0648e7cc92fae8bbf6d13b74dbeef7bc9
Test: N/A
Flag: android.content.pm.cloud_compilation_verification