Media: Fix date filter not showing uploads in Media Library

[rutviksavsani]

Changes

This PR implements two minimal changes to resolve the issue:

1. Add date filter functions (src/js/media/models/attachments.js)
   Added year and monthnum filter functions to the static Attachments.filters object (lines 598-657). These functions validate attachments against year/month filter criteria

2. Updated allowed args whitelist (src/js/media/models/query.js)
   Added 'year' and 'monthnum' to the allowed args array so Query collections observe the upload queue when date filters are active.

Trac ticket: https://core.trac.wordpress.org/ticket/61057

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