psc: make ProcessRecordInternal access ProcessServiceRecordInternal

Previously, ProcessRecordInternal had direct accessors for
service-related fields like hasAboveClient and setTreatLikeActivity.

This change refactors these to be accessed via
ProcessServiceRecordInternal, which is now exposed through
ProcessRecordInternal.getServices().

Bug: 425766486
Test: m services.core
Test: atest MockingOomAdjusterTests OomAdjusterTests
Test: atest FrameworksServicesTestsRavenwood_ProcessStateController
Flag: EXEMPT pure refactor

Change-Id: I8999044bf8fbf93a541f72acaeb9d5d8239973b5