Use imported names in Command::run signatures (#7967)

# Description

_(Thank you for improving Nushell. Please, check our [contributing
guide](../CONTRIBUTING.md) and talk to the core team before making major
changes.)_

I opened this PR to unify the run command method. It's mainly to improve
consistency across the tree.

# User-Facing Changes

None.

# 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` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# 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/filesystem/cd.rs

@@ -60,7 +60,7 @@ impl Command for Cd {
         stack: &mut Stack,
         call: &Call,
         _input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let path_val: Option<Spanned<String>> = call.opt(engine_state, stack, 0)?;
         let cwd = current_dir(engine_state, stack)?;
         let config = engine_state.get_config();

crates/nu-command/src/filesystem/ls.rs

@@ -72,7 +72,7 @@ impl Command for Ls {
         stack: &mut Stack,
         call: &Call,
         _input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let all = call.has_flag("all");
         let long = call.has_flag("long");
         let short_names = call.has_flag("short-names");

crates/nu-command/src/filesystem/mv.rs

@@ -62,7 +62,7 @@ impl Command for Mv {
         stack: &mut Stack,
         call: &Call,
         _input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         // TODO: handle invalid directory or insufficient permissions when moving
         let spanned_source: Spanned<String> = call.req(engine_state, stack, 0)?;
         let spanned_source = {

crates/nu-command/src/filesystem/open.rs

@@ -48,7 +48,7 @@ impl Command for Open {
         stack: &mut Stack,
         call: &Call,
         input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let raw = call.has_flag("raw");
         let call_span = call.head;
         let ctrlc = engine_state.ctrlc.clone();

crates/nu-command/src/filesystem/save.rs

@@ -60,7 +60,7 @@ impl Command for Save {
         stack: &mut Stack,
         call: &Call,
         input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let raw = call.has_flag("raw");
         let append = call.has_flag("append");
         let force = call.has_flag("force");

crates/nu-command/src/filesystem/start.rs

@@ -35,7 +35,7 @@ impl Command for Start {
         stack: &mut Stack,
         call: &Call,
         input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let path = call.opt::<Spanned<String>>(engine_state, stack, 0)?;
 
         let path = {

crates/nu-command/src/filesystem/watch.rs

@@ -66,7 +66,7 @@ impl Command for Watch {
         stack: &mut Stack,
         call: &Call,
         _input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let cwd = current_dir(engine_state, stack)?;
         let path_arg: Spanned<String> = call.req(engine_state, stack, 0)?;