Revert "[DO NOT MERGE]Revert "Relax minimum signature scheme ver..."

Revert submission 16943318-presubmit-am-bc566b73c1674298b82a1153c03313a1

Reason for revert: This change breaks Better Bug.
Reverted Changes:
I32a2db8c7:[automerge] [DO NOT MERGE]Revert "Relax minimum si...
Ic53d2a361:[DO NOT MERGE]Revert "Relax minimum signature sche...

Bug: 223079119

Change-Id: I987bda9df92543f082700936c20aad06f992bdb0