Use lambda expressions for conciseness in remaining places

Omitting BluetoothOppLauncherActivity.java for now as ag/30068448 was not cherry picked to AOSP. Will follow up and fix that file when we move to `main`.

Bug: 394958283
Test: m BluetoothInstrumentationTests
Test: m .
Flag: Exempt refactor no-op
Change-Id: I4b6051387c53381e348889192fe6f92e017697f9