ci: Remove codesandbox (#593)

Author: lachlancollins

.codesandbox/ci.json

@@ -7,7 +7,6 @@
   "scripts": {
     "clean": "pnpm --filter \"./packages/**\" run clean",
     "preinstall": "node -e \"if(process.env.CI == 'true') {console.log('Skipping preinstall...'); process.exit(1)}\" || npx -y only-allow pnpm",
-    "install:csb": "corepack enable && pnpm install --frozen-lockfile",
     "test": "pnpm run test:ci",
     "test:pr": "nx affected --targets=test:format,test:eslint,test:lib,test:types,test:build,build",
     "test:ci": "nx run-many --targets=test:format,test:eslint,test:lib,test:types,test:build,build",