Revert "[Wi-Fi] Apply WifiTrackerLib objects in Wi-Fi Slice"

This reverts commit 7b1aded2.

Reason for revert: Settings is crashing for WiFi selection in SetupWizard on wembley

Bug: 161434533
Change-Id: I1d90e9bae1b31862fba674db0d7497e43f987a7f
Test: Locally reverted, reflashed, and was able to select WiFi without Settings crashing.
Exempt-From-Owner-Approval: Revert to clear up P0 while all owners are outside of work hours