feat(unstable/task): fail task on async command failure (#16301)

Tests and implementation are found here:
https://github.com/denoland/deno_task_shell/pull/59

This is a breaking change, but `deno task` is unstable.

> This changes async commands so that on non-zero exit code they will
fail the entire task. For example:
> 
> ```jsonc
> // task that asynchronously starts a server and starts a watcher for
the frontend
> "dev": "deno task server & deno task frontend:watch"
> ```
> 
> Previously when running `deno task dev`, if `deno task server` failed,
the entire command would not fail, which kept in line with `sh`, but
it's not very practical. This change causes `deno task dev` to fail.
> 
> To opt out, developers can add an `|| exit 0`:
> 
> ```jsonc
> "dev": "deno task server || exit 0 & deno task frontend:watch"
> ```

Cargo.lock

@@ -1229,9 +1229,9 @@ dependencies = [
 
 [[package]]
 name = "deno_task_shell"
-version = "0.5.2"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91059ae4dccefd55b84e0582683fe41e78b4287a2fe283962ea0a1698ea43d4d"
+checksum = "9e4e1c86712e2cded9046ac6748cbe5dba87042f045265a51b1ac2629a7fa6c5"
 dependencies = [
  "anyhow",
  "futures",
@@ -1239,6 +1239,7 @@ dependencies = [
  "os_pipe",
  "path-dedot",
  "tokio",
+ "tokio-util",
 ]
 
 [[package]]

cli/Cargo.toml

@@ -57,7 +57,7 @@ deno_emit = "0.9.0"
 deno_graph = "0.34.0"
 deno_lint = { version = "0.33.0", features = ["docs"] }
 deno_runtime = { version = "0.81.0", path = "../runtime" }
-deno_task_shell = "0.5.2"
+deno_task_shell = "0.6.0"
 napi_sym = { path = "./napi_sym", version = "0.3.0" }
 
 atty = "=0.2.14"