enable iterator-helpers in webkit

[nektro]

Closes #14426

before

❯ ./build/debug/bun-debug --print '[1,2,3][Symbol.iterator]().toArray()'
1 | [1,2,3][Symbol.iterator]().toArray()
                               ^
TypeError: [1, 2, 3][Symbol.iterator]().toArray is not a function. (In '[1, 2, 3][Symbol.iterator]().toArray()', '[1, 2, 3][Symbol.iterator]().toArray' is undefined)
      at /Users/meghandenny/src/bun/[eval]:1:28
      at asyncFunctionResume (1:11)
      at promiseReactionJobWithoutPromiseUnwrapAsyncContext (1:11)
      at promiseReactionJob (1:11)

after

❯ ./build/debug/bun-debug --print '[1,2,3][Symbol.iterator]().toArray()'
[ 1, 2, 3 ]

[robobun]

❌ @nektro, your commit 985b805 has 11 failures in #4608:

test/v8/v8.test.ts - 23 failing on 🐧 20.04 aarch64

test/js/web/fetch/fetch-tcp-stress.test.ts - timeout on 🍎 14 aarch64

test/js/web/fetch/fetch-tcp-stress.test.ts - timeout on 🍎 14 x64

test/js/web/streams/streams.test.js - 1 failing on 🍎 13 aarch64

test/js/node/test/parallel/zlib.test.js - 1 failing on 🍎 14 aarch64

test/js/bun/http/fetch-file-upload.test.ts - 1 failing on 🪟 x64-baseline

test/js/bun/http/fetch-file-upload.test.ts - 1 failing on 🪟 x64

test/cli/watch/watch.test.ts - 2 failing on 🪟 x64

test/cli/watch/watch.test.ts - 2 failing on 🪟 x64-baseline

test/bundler/bundler_compile.test.ts - 5 failing on 🪟 x64

test/js/node/fs/fs-promises-writeFile-async-iterator.test.ts - timeout on 🍎 14 aarch64

test/cli/hot/watch.test.ts - 1 failing on 🪟 x64-baseline

test/cli/hot/watch.test.ts - 1 failing on 🪟 x64

test/js/bun/http/bun-serve-static.test.ts - 1 failing on 🍎 14 aarch64

test/bundler/bun-build-api.test.ts - 3 failing on 🍎 13 aarch64

test/bundler/bun-build-api.test.ts - 3 failing on 🍎 14 aarch64

test/bundler/bun-build-api.test.ts - 3 failing on 🪟 x64-baseline

test/bundler/bun-build-api.test.ts - 3 failing on 🪟 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🍎 14 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🍎 13 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 22.04 x64-baseline

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 20.04 x64-baseline

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 12 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 12 x64-baseline

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 22.04 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 20.04 x64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 20.04 aarch64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 22.04 aarch64

test/bundler/bun-build-api.test.ts - 3 failing on 🐧 12 aarch64