Revert "recovery: Ask to reboot before installing anything after A/B update"

This reverts commit a11e95ff.

Revert "recovery: Bypass reboot prompt for sideload-auto-reboot"

This reverts commit b27281fb.

Revert "recovery: Simplify reboot recovery reason"

This reverts commit ae8668f9.

Revert "recovery: Clear BCB before rebooting to recovery"

This reverts commit d8a97bcc.