[automerger skipped] Add tests for duplicate PendingIntent requests am: 3674367bcc -s ours

am skip reason: Merged-In Ic636c731c71474ef09043d7a26ccfd6e2bb5c39f with SHA-1 489275e84e is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/15068269

Change-Id: I856adffad2150ac768b1cada280a390acf3e1ab0