feat(files): restore unified search filtering in files view

feat(files): restore unified search filtering in files view

The unified search emits, search events that other apps can subscribe to and
 react however they want to search queries, following
 4b55594f55ce4146ed93c50f71e6204a57d29612 and prior updates to migrate the Files
app ui to vue.js that feature was broken.

This commit reintroduces the feature using the current `FileList` implementation.

This commit also adds some logging to an empty exception handler.

Resolve : https://github.com/nextcloud/server/issues/43365

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>
(cherry picked from commit 29c37af40c7c28ef17da4b9565e8c30fab27fec4)
Signed-off-by: Christopher Ng <chrng8@gmail.com>