test/crimson: disable stall-detector on aarch64 to fix asan failures
Ceph crimson uses seastar on debug mode which would enable ASAN, while stall-detector uses glibc backtrace function which would cause ASAN failures on aarch64.
Reason see scylladb/scylladb#15090 (comment)
Because arm ci servers in lab are "elderly", causing stall happened often, this PR is to disable stall-detector until seastar upstream migrated to libunwind, see scylladb/seastar#1878
Seastar does not provide a function to disable stall-detector, at present, increase stall-detector time to avoid stall-detector timeout on arm platform.