Enable relative content paths for the oxide engine (#10621)

* enable `relativeContentPathsByDefault` for the `oxide` engine

* update tests to reflect `relative` change in the `oxide` engine

* update changelog

src/featureFlags.js

@@ -8,6 +8,9 @@ let defaults = {
   get disableColorOpacityUtilitiesByDefault() {
     return env.OXIDE
   },
+  get relativeContentPathsByDefault() {
+    return env.OXIDE
+  },
 }
 
 let featureFlags = {

src/util/normalizeConfig.js

@@ -1,3 +1,4 @@
+import { flagEnabled } from '../featureFlags'
 import log, { dim } from './log'
 
 export function normalizeConfig(config) {
@@ -189,7 +190,7 @@ export function normalizeConfig(config) {
         return content.relative
       }
 
-      return config.future?.relativeContentPathsByDefault ?? false
+      return flagEnabled(config, 'relativeContentPathsByDefault')
     })(),
 
     files: (() => {