Merge "Revert "Revert "Drop all path-related methods from android::String8""" into main am: b2b037d9f0 am: e4fc1fb947 am: 4b17b30ab8

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2745823

Change-Id: If985e421d6ad4b116bca8bd54ee045a921e36ab0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>