Merge "Drop all path-related methods from android::String8" into main am: cc64ed9865 am: eb6aa6ae0f am: a31e9afdc1

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2724277

Change-Id: I0bdc8a80050c8e5edca2f083e317e0c9c0649344
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>