[automerger skipped] [DO NOT MERGE] Add newline to each generated bash script in rbe_test.go. am: b258d936 am: 7abebafe -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/12598126

Change-Id: I9d42ea6b04029cf87d1e9c9a0fc132634032c887