WifiConnectivityManager: Refactor for automotive STA + STA (Part 3)

Handle no candidates early to avoid duplication when automotive STA +
STA trigger is added.

Bug: 169413079
Test: atest com.android.server.wifi
Change-Id: Ib030f06596001a06ba85354f94225560e1857d8f
2 files changed
tree: ca3def68141ccbd06fd3b023c7cff3b57a551193
  1. apex/
  2. service/
  3. metrics_pdd_hook.py
  4. PREUPLOAD.cfg