Validate triggers when added to service

Triggers are currently validated on the manager side, validate in
service as well to ensure invalid triggers cannot be added.

Test: presubmit
Bug: 425360073
Flag: EXEMPT - bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e57d3597f0eb2e0bdabbf174cf57b41caee0627a)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:57d3f4da1ff871e18db8795fb2dd2e9857422884
Merged-In: I422171ef7cb8519f5c138f1b39ae9a008a0df7ae
Change-Id: I422171ef7cb8519f5c138f1b39ae9a008a0df7ae