Remove migration from legacy keychain #5237
Merged
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This was used to migrate checkin info for users who use a very old version of fcm or gcm to newer version. However, because most users have migrate off gcm and we no longer log substantial data in checkin, so it wouldn't hurt for small amount of users who get a new checkin and accordingly a new refresh token when updating.
This also reduce number of keychain read write operations during first app install.
Also update changelog for release.