Implement an empty constructor for DialogFragments

Without an empty constructor, Pia crashes when a configuration change
takes palce. Data required by these dialogFragments are now set to
fragment arguments. This means that AppSnippet is now required to be
parcellable.

Bug: 394724957
Test: atest CtsPackageInstallTestCases CtsPackageUninstallTestCases CtsPackageInstallerCUJInstallationTestCases
Flag: android.content.pm.use_pia_v2
Change-Id: If1ff2de6f4ad286619fc40bb10c0b24ec6be5a31