Don't show sources if their count has not changed

[AetherUnbound]

Description

Follow-up to #4067

Here's the report from the most recent audio data refresh:

The current logic is set to show all sources, regardless of whether there was a change or not. This PR changes the logic so only sources that have increased or decreased in size are shown in the final report. While this doesn't have a huge effect on audio data refreshes, it will for image data refreshes since we have significantly more sources there.

Testing Instructions

Updated tests should pass. Alternatively, run the data refresh locally after just api/init and see that no sources are listed in the completion message because none of the counts changed.

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[krysal]

Nice.

[dhruvkb]

+1 for @krysal's suggestions. Do we need to handle a case where all sources are unchanged? That seems unlikely to ever occur at all.

[AetherUnbound]

Do we need to handle a case where all sources are unchanged? That seems unlikely to ever occur at all.

Only in local testing I would imagine! I don't think it's worth having logic for that case, personally. And I've made the message about unchanged sources ambiguous enough that it should cover the case where all sources are absent too

[obulat]

LGTM!