Stylelint: Fix auto-fixables (#43213)

* Undisable length-zero-no-unit

* Handle length-zero-no-unit in non-style files

* Undisable selector-attribute-quotes

* Handle some instances of selector-attribute-quotes manually

* Undisable value-keyword-case

* Remove value-keyword-case violation that is redundant

* Undisable function-url-quotes

* Undisable declaration-block-no-duplicate-properties

* Alphabetize rules

* Add changelogs

* Keep no-descending-specificity disabled with a comment

* Oops, unfix these

* Add link to recommendation to disable no-descending-specificity if nesting is used

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/14626617107

Upstream-Ref: Automattic/jetpack@817c26e

Author: tbradsha

CHANGELOG.md

@@ -17,6 +17,7 @@ This is an alpha version! The changes listed here are not final.
 
 ### Fixed
 - Code: Update stylesheets to use hex instead of named colors.
+- Linting: Fix more Stylelint violations.
 
 ## [2.0.1] - 2025-04-04
 ### Changed

styling/dashboard.css

@@ -107,7 +107,7 @@
 .wpsc-nav-tab:hover,
 .wpsc-nav-tab:focus,
 .wpsc-nav-tab.wpsc-nav-tab-selected {
-	box-shadow: inset 0px -1px 0px rgb(0, 0, 0);
+	box-shadow: inset 0 -1px 0 rgb(0, 0, 0);
 }
 
 .wpsc-nav-tab a {

wp-cache.php

@@ -1115,7 +1115,7 @@ function toggleLayer( whichLayer ) {
 	<style>
 		.wpsc-boost-banner {
 			margin: 2px 1.25rem 1.25rem 0;
-			box-shadow: 0px 2px 6px rgba(0, 0, 0, 0.03), 0px 1px 2px rgba(0, 0, 0, 0.03);
+			box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.03);
 			border: 1px solid #d5d5d5;
 			position: relative;
 		}