Rename APIs per API Council review

Renamed getInstallInfo to readInstallInfo
Renamed getIsPreApprovalRequested to isPreApprovalRequested

Bug: 265793251
Test: atest CtsPackageInstallTestCases:InstallInfoTest

Change-Id: I0ac9314fa8d174e4e04e56574eebea965e9b2e74
3 files changed