restore stubbed code paths in OutputFile.writeToDisk

[paperdave]

saw a crash report here. i cant believe none of our thousand bundler tests hit this. that makes me think this code path is only hit in some absurd legacy situation we should just delete. i've added a TODO comment on the union(enum).

later i want to ban @panic("TODO as a phrase in the codebase at all. it is terrible this was not caught.

regression from #14622

[robobun]

:x: @paperdave, your commit d08af32845586974e2b4aac238a643ec10b05aa8 has 15 failures in #6465:

test/cli/install/registry/bun-install-registry.test.ts - timeout on 🐧 3.20 x64

test/cli/install/registry/bun-install-registry.test.ts - timeout on 🐧 3.20 x64-baseline

test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🐧 3.20 x64

test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🐧 3.20 x64-baseline

test/v8/v8.test.ts - 22 failing on 🐧 3.20 aarch64

test/v8/v8.test.ts - 22 failing on 🐧 3.20 x64-baseline

test/v8/v8.test.ts - 22 failing on 🐧 3.20 x64

test/js/bun/http/serve.test.ts - segmentation fault on 🐧 3.20 aarch64

test/js/bun/http/serve.test.ts - segmentation fault on 🐧 3.20 x64-baseline

test/js/bun/http/serve.test.ts - segmentation fault on 🐧 3.20 x64

test/integration/next-pages/test/next-build.test.ts - 1 failing on 🐧 22.04 x64

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 aarch64

test/js/node/child_process/child_process.test.ts - timeout on 🐧 2023 aarch64

test/js/node/child_process/child_process.test.ts - timeout on 🐧 2023 x64

test/js/node/child_process/child_process.test.ts - timeout on 🐧 2023 x64-baseline

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 x64

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 x64-baseline

test/js/node/test/parallel/timers-ordering.test.js - 1 failing on 🐧 22.04 x64

test/js/node/test/parallel/timers-ordering.test.js - 1 failing on 🐧 22.04 x64-baseline

test/cli/run/run-crash-handler.test.ts - timeout on 🐧 2023 aarch64

test/cli/run/run-crash-handler.test.ts - timeout on 🐧 2023 x64

test/cli/run/run-crash-handler.test.ts - timeout on 🐧 2023 x64-baseline

test/cli/install/bun-run.test.ts - timeout on 🐧 2023 aarch64

test/cli/install/bun-link.test.ts - 4 failing on 🐧 3.20 aarch64

test/cli/install/bun-link.test.ts - 4 failing on 🐧 3.20 x64

test/cli/install/bun-link.test.ts - 4 failing on 🐧 3.20 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 11 aarch64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 11 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 11 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 12 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 12 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 aarch64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 20.04 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 22.04 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 20.04 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 2023 aarch64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 2023 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 2023 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 x64-baseline

test/js/third_party/body-parser/express-bun-build-compile.test.ts - 1 failing on 🐧 2023 aarch64

test/js/third_party/body-parser/express-bun-build-compile.test.ts - 1 failing on 🐧 2023 x64

test/js/third_party/body-parser/express-bun-build-compile.test.ts - 1 failing on 🐧 2023 x64-baseline

test/cli/hot/hot.test.ts - 1 failing on 🐧 12 aarch64

test/bundler/cli.test.ts - 1 failing on 🐧 2023 aarch64

test/bundler/cli.test.ts - 1 failing on 🐧 2023 x64

test/bundler/cli.test.ts - 1 failing on 🐧 2023 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🍎 13 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🍎 14 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 11 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 20.04 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 22.04 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 12 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 11 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 20.04 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 12 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 20.04 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 12 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 11 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 2023 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 22.04 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 22.04 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 3.20 aarch64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🍎 13 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🍎 14 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 2023 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 2023 x64-baseline

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 3.20 x64

test/js/bun/util/fuzzy-wuzzy.test.ts - segmentation fault on 🐧 3.20 x64-baseline