Use const pointers where appropriate in dynamic_instrumentation_manager

This change also updates a comment in Shell/AndroidManifest.xml to
indicate the correct name for CtsDynamicInstrumentationManagerTest.

Bug: 372925025
Test: CtsDynamicInstrumentationManagerTest
Flag: android.uprobestats.flags.executable_method_file_offsets
Change-Id: If6f255bec043cce5ca275bcf0b70337404c0353d