[PM] Add PackageInstaller CUJ test case (8/N)

- Find the checkable object and the test object to grant the
  permission. If there are more than one checkable item, check
  the sibling text label.
- Optimize the flow to reduce waiting time for GPP dialog and
  Installing dialog.
- Find the PackageInstaller objects with PackageInstaller's package
  name to avoid finding the wrong objects.

Bug: 344550588
Bug: 332323025
Test: atest CtsPackageInstallerCUJTestCases
Change-Id: I9b519b9c8d9a5291f7160e15319ec617e47e812f