Update ConnectivityCheckTargetPreparer references

Use the new ConnectivityTestTargetPreparer name instead, as the preparer
is being made more generic.

Bug: 263665773
Test: m
Ignore-AOSP-First: In a topic with internal-only repo. Will cherry-pick
                   to AOSP immediately afterwards.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:22e7c25731e6e655a7b86c3b6e4e302cf7111a60)
Merged-In: I520e92c449f366c51cda2f8b33fe9a354a8c0445
Change-Id: I520e92c449f366c51cda2f8b33fe9a354a8c0445
3 files changed