[omni] Read long press duration from AppSearch and override server configured value.

Notify the appsearch values to systemui through SystemUiProxy.
See http://shortn/_WqYj0buH7R  for summary

Bug: 330446188
Test: manual. Side load agsa apk to read the value from AppSearch
Flag: legacy CUSTOM_LPNH_THRESHOLDS enabled
Change-Id: I7bd2688178da48ae8eb9e62e135304cba2fec8ce