fix: Remove randomized css widths

[ttannis]

Summary of Changes

Using randomized widths negates the effects of css content hashing, as the built content will be different each time due to the random widths. This PR removes those usages, and for now I have just chosen 75% for widths that need a percentage, and splitting the different between the old max width and min width for others.

Tests

N/A but confirmed the build returns the same contenthash each time.

Documentation

N/A

CheckList

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[Golodhros]

You could remove this one too

[ttannis]

$shimmer-loader-row-min-width still used on line 79 for now, do you want to remove that too?

[Golodhros]

LGTM

[Golodhros]

LGTM