Revert 9693 to prevent CPU hangs (#9893)

# Description

This reverts #9693 as it lead to CPU hangs. (btw, did the revert by hand
as it couldn't be done automatically. Hopefully I didn't miss anything 😅
)

Fixes #9859

cc @IanManske 

# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->

# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect -A clippy::result_large_err` to check that
you're using the standard code style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- -c "use std testing; testing run-tests --path
crates/nu-std"` to run the tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->

# After Submitting
<!-- If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
-->

crates/nu-command/src/system/run_external.rs

@@ -213,7 +213,7 @@ impl ExternalCommand {
             // fails to be run as a normal executable:
             // 1. "shell out" to cmd.exe if the command is a known cmd.exe internal command
             // 2. Otherwise, use `which-rs` to look for batch files etc. then run those in cmd.exe
-            match fg_process.spawn(engine_state.is_interactive) {
+            match fg_process.spawn() {
                 Err(err) => {
                     // set the default value, maybe we'll override it later
                     child = Err(err);
@@ -235,7 +235,7 @@ impl ExternalCommand {
                             cmd,
                             engine_state.pipeline_externals_state.clone(),
                         );
-                        child = cmd_process.spawn(engine_state.is_interactive);
+                        child = cmd_process.spawn();
                     } else {
                         #[cfg(feature = "which-support")]
                         {
@@ -269,8 +269,7 @@ impl ExternalCommand {
                                                     cmd,
                                                     engine_state.pipeline_externals_state.clone(),
                                                 );
-                                                child =
-                                                    cmd_process.spawn(engine_state.is_interactive);
+                                                child = cmd_process.spawn();
                                             }
                                         }
                                     }
@@ -287,7 +286,7 @@ impl ExternalCommand {
 
         #[cfg(not(windows))]
         {
-            child = fg_process.spawn(engine_state.is_interactive)
+            child = fg_process.spawn()
         }
 
         match child {