remove deprecated logins checkpoint api

[FlyingBaum]

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• Breaking changes: This PR follows our breaking change policy
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[FlyingBaum]

Last week I did a mach try with my vendored changes here and there were no failures related to the removals of this PR.
However, there were several other failures from previous AS commits that have not been vendored over to m-c before. I am running another mach try here and will try finding the breaking changes.
Android and iOS are not affected by this PR.

The m-c patch is here.

[jo]

Nice!