Remove dependency to DumpManager from PerDisplayRepository

This allows the class to be moved into displaylib without having systemui dependencies.

Note how the test for PerInstanceRepository didn't change at all, but is testing also the new dumpable wrapper regardless as the same instance of PerDisplayRepoDumpHelper is provided in tests.

Bug: 401305290
Test: PerDisplayInstanceRepositoryImplTest
Flag: NONE - Just moving code around
Change-Id: I94e199ca565628a1ed85d7f9fc89688e79253795