Compare View, Usability: Filter Missing Data per CSS per default

[smarr]

See for example:

https://rebench.dev/TruffleSOM/compare/f614a64c4558d4f744d814770318ea79e873743d..7d8f9c2d0ec479e5bca841516537ecb4b1a5b286

• 1. There's a big table with missing data. I think we can use CSS to hide everything after a number of rows. But would be good to have a final row in the filtered table that allows us to expand it on demand.

• 2. There are many missing entries in the table. I think we also want to hide them with CSS class normally.

The top right corner has a filter icon. When clicking on that, we should be able to enable/disable that particular filtering.

[smarr]

@F12-Syntex implemented the first bit of this with #208. Thanks!