Move visual tests to src/test/renderer

[srmagura]

Working towards completing #1556.

Btw, the visual regression tests workflow seems to be broken. I'm not sure if I broke it or if it was already like this. The visual tests work when I run them locally.

Run npx reg-suit run --test
[reg-suit] info version: 0.10.16
[reg-suit] info Skipped to detect the previous snapshot key because key generator plugin is not set up.
[reg-suit] info Skipped to fetch the expected data because expected key is null.
[reg-suit] info Comparison Complete
[reg-suit] info    Changed items: 0
[reg-suit] info    New items: 0
[reg-suit] info    Deleted items: 0
[reg-suit] info    Passed items: 0
[reg-suit] info Use 'snapshot_1632892749' as the current snapshot key because key generator plugin is not set up.
[reg-suit] info Skipped to publish the snapshot data because publisher plugin is not set up.
[reg-suit] info Skipped to notify result because notifier plugins are not set up.

[Gerrit0]

I'm guessing the visual regression workflow is broken because of the moving, and that it's not something you did/could prevent, I suspect it'll start working once PRs are based on commits after this is merged.

[Gerrit0]

One thing, then this looks good

[Gerrit0]

Thanks!