Revert "Enable genrule sandboxing by default"

Revert submission 2782270-genrule_sandboxing_by_default

Reason for revert: Potential culprit for b/305851039 and many other build breakages - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:2782270-genrule_sandboxing_by_default

Change-Id: I3a8eb5d3a6a9e0d51ed7798c99187e9ca236b7bd