Fix warnings and old names (#8457)

# Description

This fixes up some clippy warnings and removes some old names/info from
our unit tests

# User-Facing Changes

Internal changes only

# 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

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```

# 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/tests/commands/open.rs

@@ -10,7 +10,7 @@ fn parses_csv() {
             "nu.zion.csv",
             r#"
                     author,lang,source
-                    Jonathan Turner,Rust,New Zealand
+                    JT Turner,Rust,New Zealand
                     Andres N. Robalino,Rust,Ecuador
                     Yehuda Katz,Rust,Estados Unidos
                 "#,
@@ -180,7 +180,7 @@ fn parses_xml() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         pipeline(r#"
-            open jonathan.xml
+            open jt.xml
             | get content
             | where tag == channel
             | get content
@@ -193,10 +193,7 @@ fn parses_xml() {
         "#)
     );
 
-    assert_eq!(
-        actual.out,
-        "http://www.jonathanturner.org/2015/10/off-to-new-adventures.html"
-    )
+    assert_eq!(actual.out, "https://www.jntrnr.com/off-to-new-adventures/")
 }
 
 #[cfg(feature = "dataframe")]
@@ -242,7 +239,7 @@ fn open_dir_is_ls() {
     Playground::setup("open_dir", |dirs, sandbox| {
         sandbox.with_files(vec![
             EmptyFile("yehuda.txt"),
-            EmptyFile("jonathan.txt"),
+            EmptyFile("jttxt"),
             EmptyFile("andres.txt"),
         ]);