[DO NOT MERGE] wifi: remove certificates for network factory reset

When a user does network factory reset, wifi certificate should
also be cleared as these certificates are also personal credentials.

Bug: 231985227
Test: atest FrameworksWifiTests
Merged-In: I0334064347080e43096d01f00cf516804812d0c0
Change-Id: I0334064347080e43096d01f00cf516804812d0c0
(cherry picked from commit 4a354057cb4c5e9c2daebe574c10593885bf94b4)
Merged-In: I0334064347080e43096d01f00cf516804812d0c0
9 files changed