Rollup merge of rust-lang#123554 - GuillaumeGomez:cleanup-search-result-color, r=notriddle

Simplify/cleanup `search-result-color.goml`

Greatly shorten code of `search-result-color.goml` GUI test.

I split the changes into smaller commits to allow to more easily see what changed.

r? `@notriddle`

Author: GuillaumeGomez