[automerge] Avoid going over max service name length when renaming NSD services 2p: 34b5eeae9f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23023746

Bug: 265865456
Change-Id: I2bb115cb4712e6aaf0a082785ec272061dc68cf0
Merged-In: I077d8abdb91071db62b9618d9918e3a12682aaf4