Remove SEARCH_ONBOARDING_COUNT & QSB_SEARCH_ONBOARDING_CARD_DISMISSED.

Launcher Search related educards is being sent from AiAi now and we
don't need to hold the count in launcher.

Flag: NA
Bug: 265476821
Test: Manual

Change-Id: I5374e7cab6551d44fc995adb3b3a46173169ab6c
Merged-In: I5374e7cab6551d44fc995adb3b3a46173169ab6c