Breeze Icons resource building change and test

[Christoph Cullmann]

Hi,

Breeze Icons resource building got changed back to big resource
and a unit test was added to check if stuff is missing.

You might need to turn off LTO.

See

https://invent.kde.org/frameworks/breeze-icons/-/merge_requests/481

and linked bugs for details.

Greetings
Christoph
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