sharing: Turn "File Sharing" dialog into a subpage

Automeris naranjarequested to merge
automerisnaranja/gnome-control-center:pages-sharing into main

And remove unused object IDs.

See also: #3020

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Screenshot_from_2024-10-18_12-14-15 Screenshot_from_2024-10-18_12-13-29
Edited by Automeris naranja

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