Merge "Add test for SequencedCollection.add* methods" into main am: 8a9039332e

Original change: https://android-review.googlesource.com/c/platform/libcore/+/2979493

Change-Id: Id596f503adcc7f25c5920fdcccd4600397943b2a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>