Fix bug with // @bun annotation in main thread

[Jarred-Sumner]

What does this PR do?

// @bun broke due to async transpiler

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

I wrote automated tests

Checklist

If JavaScript/TypeScript modules or builtins changed:

• I ran make js and committed the transpiled changes
• I or my editor ran Prettier on the changed files (or I ran bun fmt)
• I included a test for the new code, or an existing test covers it

If Zig files changed:

• I checked the lifetime of memory allocated to verify it's (1) freed and (2) only freed when it should be
• I or my editor ran zig fmt on the changed files
• I included a test for the new code, or an existing test covers it
• JSValue used outside outside of the stack is either wrapped in a JSC.Strong or is JSValueProtect'ed

If new methods, getters, or setters were added to a publicly exposed class:

• I added TypeScript types for the new methods, getters, or setters

If dependencies in tests changed:

• I made sure that specific versions of dependencies are used instead of ranged or tagged versions

If functions were added to exports.zig or bindings.zig

• I ran make headers to regenerate the C header file

If *.classes.ts files were added or changed:

• I ran make codegen to regenerate the C++ and Zig code

If a new builtin ESM/CJS module was added:

• I updated Aliases in module_loader.zig to include the new module
• I added a test that imports the module
• I added a test that require() the module

[github-actions]

❌ @Jarred-Sumner 1 files with test failures on linux-x64:

• test/js/node/child_process/child_process-node.test.js

View test output

^{#ba636613fb5dbf6bda30efe6b4db07a5a52a6563}

[github-actions]

❌ @Jarred-Sumner 1 files with test failures on linux-x64-baseline:

• test/js/node/child_process/child_process-node.test.js

View test output

^{#ba636613fb5dbf6bda30efe6b4db07a5a52a6563}

[github-actions]

❌ @Jarred-Sumner 3 files with test failures on bun-darwin-aarch64:

• test/js/bun/net/socket.test.ts
• test/js/bun/spawn/spawn.test.ts
• test/js/bun/test/test-test.test.ts

View test output

^{#ba636613fb5dbf6bda30efe6b4db07a5a52a6563}