chore: Added tracing span for build script execution (#16053)

### What does this PR try to resolve?

While reading up on how Cargo's build script implementation I noticed we
do not have any tracking for it build script execution.
This PR adds a span for build script execution giving better
visualization for `CARGO_LOG_PROFILE`.

Example output:

<img width="2325" height="1109" alt="image"
src="https://github.com/user-attachments/assets/945c1a14-90a6-4520-b27b-6e94f8619099"
/>

NOTE: The `cmd.to_string()` is only executed when the tracing level is
DEBUG so it should not be executed under normal conditions.

Author: weihanglo

src/cargo/core/compiler/custom_build.rs

@@ -564,8 +564,9 @@ fn build_work(build_runner: &mut BuildRunner<'_, '_>, unit: &Unit) -> CargoResul
         let timestamp = paths::set_invocation_time(&script_run_dir)?;
         let prefix = format!("[{} {}] ", id.name(), id.version());
         let mut log_messages_in_case_of_panic = Vec::new();
-        let output = cmd
-            .exec_with_streaming(
+        let span = tracing::debug_span!("build_script", process = cmd.to_string());
+        let output = span.in_scope(|| {
+            cmd.exec_with_streaming(
                 &mut |stdout| {
                     if let Some(error) = stdout.strip_prefix(CARGO_ERROR_SYNTAX) {
                         log_messages_in_case_of_panic.push((Severity::Error, error.to_owned()));
@@ -612,7 +613,8 @@ fn build_work(build_runner: &mut BuildRunner<'_, '_>, unit: &Unit) -> CargoResul
                 }
 
                 build_error_context
-            });
+            })
+        });
 
         // If the build failed
         if let Err(error) = output {