[v14.x] Allow passing FileHandle objects via postMessage
Backport of #33772 (only one minor conflict, between the first commit and https://github.com/nodejs/node/pull/33600)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Backport of #33772 (only one minor conflict, between the first commit and https://github.com/nodejs/node/pull/33600)