[v16.x backport] fs: use signed types for stat data
Backport of: https://github.com/nodejs/node/pull/43714
On arm-12+, fsPromises.stat timestamps are returned as 0 even for small positive values. Excluding this platform from test.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Backport of: https://github.com/nodejs/node/pull/43714
On arm-12+, fsPromises.stat timestamps are returned as 0 even for small positive values. Excluding this platform from test.