Set --single-package everywhere we can. (#6102)

After parsing args the `run_args` can appear in different places in the
struct depending upon how it was invoked. This sets all possible
locations.

The distinction here is:
```
turbo run build --single-package
turbo build --single-package
```

Closes TURBO-1423

Co-authored-by: Nathan Hammond <Nathan Hammond>

crates/turborepo-lib/src/cli.rs

@@ -4,7 +4,6 @@ use anyhow::{anyhow, Result};
 use camino::Utf8PathBuf;
 use clap::{ArgAction, CommandFactory, Parser, Subcommand, ValueEnum};
 use clap_complete::{generate, Shell};
-use itertools::Itertools;
 use serde::{Deserialize, Serialize};
 use tracing::{debug, error};
 use turbopath::AbsoluteSystemPathBuf;
@@ -233,10 +232,16 @@ impl Args {
         let mut clap_args = match Args::try_parse_from(single_package_free) {
             Ok(mut args) => {
                 // And then only add them back in when we're in `run`.
+                // The value can appear in two places in the struct.
+                // We defensively attempt to set both.
                 if let Some(ref mut run_args) = args.run_args {
                     run_args.single_package = is_single_package
                 }
 
+                if let Some(Command::Run(ref mut run_args)) = args.command {
+                    run_args.single_package = is_single_package;
+                }
+
                 args
             }
             // Don't use error logger when displaying help text