test: only run lighthouse test 1x per mode

Author: danielroe

package.json

@@ -32,8 +32,8 @@
     "generate:fixtures": "node scripts/generate-fixtures.ts",
     "generate:lexicons": "lex build --lexicons lexicons --out shared/types/lexicons --clear",
     "test": "vite test",
-    "test:a11y": "pnpm build:test && pnpm test:a11y:prebuilt",
-    "test:a11y:prebuilt": "LIGHTHOUSE_COLOR_MODE=dark ./scripts/lighthouse-a11y.sh && LIGHTHOUSE_COLOR_MODE=light ./scripts/lighthouse-a11y.sh",
+    "test:a11y": "pnpm build:test && LIGHTHOUSE_COLOR_MODE=dark pnpm test:a11y:prebuilt && LIGHTHOUSE_COLOR_MODE=light pnpm test:a11y:prebuilt",
+    "test:a11y:prebuilt": "./scripts/lighthouse-a11y.sh",
     "test:browser": "pnpm build:test && pnpm test:browser:prebuilt",
     "test:browser:prebuilt": "playwright test",
     "test:browser:ui": "pnpm build:test && pnpm test:browser:prebuilt --ui",