This is part of the changes to improve the UX and language for installing certificates.
Previously, the different types of certificate used the same installation flow. This CL
introduces a new settings page, where the type of certificate to be installed can be selected.
Bug: 139173976
Test: Atest com.android.settings.security
manual testing from Settings by selecting the certificate type
preference and ensuring the installation flow still worked as expected.
Change-Id: Iea7c91aa3801e429f0e22d29469958f4151b3cba
