[Emotion] Memoize styles + opinionated clean up more components #8172
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+ remove unnecessary function for styles w/ no theme token + inline JSX where possible
- disabled opacity is fairly static and can be DRYed out - loading spinner: no styles being applied so this isn't necessary
+ remove passed `layout` arg in favor of static definitions - rewrite vertical vs horizontal gutters utils to be slightly less confusing + replace `calc()` with `mathWithUnits()`
+ prefer inline JSX
+ rerun VRT to confirm no regressions. changes are minute/from font aliasing
- replace `EuiHideFor/ShowFor` usage with a breakpoint hook instead
+ remove unnecessary fragments + remove some unnecessary callback consts, just inline them if they're not reused and we're not going to memoize them
- `list_group_item` has too much conditional JSX to deal with right now, should likely be split up into subcomponents in the future + remove unnecessary style functions, just use a static obj instead + re-run VRT screenshots
+ reduce # of style fns for horizontal steps, and remove unnecessary onClick fn in favor of just inlining it (if we're not reusing or memoizing it) + update VRT
- instead of another div and repeated CSS, just use `> *` (which has zero specificity and is very overrideable) to bump the icon/avatar above the vertical line + inline `iconRender` and `ariaLabel`, it's not reused and not particularly increasing readability by being a const
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Summary
Part of #7561
TODO: probably split this up to 2 PRs
QA
Remove or strikethrough items that do not apply to your PR.
General checklist
@defaultif default values are missing) and playground toggles