Skip WiFi access in CtsWifiTestCases module if feature not supported

Test cases are using wifi manager instance which is null when WiFi feature not enabled.
This change stops the test from accessing Wifi Manager based on WiFi feature availabiliy.

Bug: 262228635
Test: Executed all CtsWifiTestCases tests on system with and without WiFi feature
Merged-In: Iff1e4c72ee5fd028c27013d0a6357a62dfe8b397
Change-Id: Iff1e4c72ee5fd028c27013d0a6357a62dfe8b397
(cherry picked from commit 81d806f3b300fd7564a009fd33892f23fc01c534)
2 files changed