[revert] [workflow] workflows/stale.yml to detect stale issues and PRs (#1035)
[revert] [workflow] workflows/stale.yml to detect stale issues and PRs (#1035)

This reverts commit 090bbf314a2fda38f6379d1f19ec2a6da9974a29.
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi