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/viewers/griddle.rs

@@ -62,7 +62,7 @@ prints out the list properly."#
         stack: &mut Stack,
         call: &Call,
         input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+    ) -> Result<PipelineData, ShellError> {
         let width_param: Option<i64> = call.get_flag(engine_state, stack, "width")?;
         let color_param: bool = call.has_flag("color");
         let separator_param: Option<String> = call.get_flag(engine_state, stack, "separator")?;

crates/nu-command/src/viewers/table.rs

@@ -613,7 +613,7 @@ fn handle_row_stream(
     row_offset: usize,
     ctrlc: Option<Arc<AtomicBool>>,
     metadata: Option<PipelineMetadata>,
-) -> Result<PipelineData, nu_protocol::ShellError> {
+) -> Result<PipelineData, ShellError> {
     let stream = match metadata {
         // First, `ls` sources:
         Some(PipelineMetadata {