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.

tests/fixtures/formats/jt.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
 	<channel>
-		<title>Jonathan Turner</title>
-		<link>http://www.jonathanturner.org</link>
-		<atom:link href="http://www.jonathanturner.org/feed.xml" rel="self" type="application/rss+xml" />
+		<title>JT</title>
+		<link>http://www.jntrnr.com</link>
+		<atom:link href="https://www.jntrnr.com/atom.xml" rel="self" type="application/rss+xml" />
 		
 			<item>
 				<title>Creating crossplatform Rust terminal apps</title>
@@ -14,8 +14,8 @@
 &lt;p&gt;Part of the adventure is not seeing the way ahead and going anyway.&lt;/p&gt;
 </description>
 				<pubDate>Mon, 05 Oct 2015 00:00:00 +0000</pubDate>
-				<link>http://www.jonathanturner.org/2015/10/off-to-new-adventures.html</link>
-				<guid isPermaLink="true">http://www.jonathanturner.org/2015/10/off-to-new-adventures.html</guid>
+				<link>https://www.jntrnr.com/off-to-new-adventures/</link>
+				<guid isPermaLink="true">https://www.jntrnr.com/off-to-new-adventures/</guid>
 			</item>
 		
 	</channel>

tests/shell/pipeline/commands/external.rs

@@ -148,7 +148,7 @@ mod it_evaluation {
     fn takes_rows_of_nu_value_strings() {
         Playground::setup("it_argument_test_1", |dirs, sandbox| {
             sandbox.with_files(vec![
-                EmptyFile("jonathan_likes_cake.txt"),
+                EmptyFile("jt_likes_cake.txt"),
                 EmptyFile("andres_likes_arepas.txt"),
             ]);
 
@@ -163,7 +163,7 @@ mod it_evaluation {
                 "#
             ));
 
-            assert_eq!(actual.out, "jonathan_likes_cake.txt");
+            assert_eq!(actual.out, "jt_likes_cake.txt");
         })
     }
 
@@ -436,7 +436,7 @@ mod external_command_arguments {
             "expands_table_of_primitives_to_positional_arguments",
             |dirs, sandbox| {
                 sandbox.with_files(vec![
-                    EmptyFile("jonathan_likes_cake.txt"),
+                    EmptyFile("jt_likes_cake.txt"),
                     EmptyFile("andres_likes_arepas.txt"),
                     EmptyFile("ferris_not_here.txt"),
                 ]);
@@ -450,7 +450,7 @@ mod external_command_arguments {
 
                 assert_eq!(
                     actual.out,
-                    "andres_likes_arepas.txt ferris_not_here.txt jonathan_likes_cake.txt"
+                    "andres_likes_arepas.txt ferris_not_here.txt jt_likes_cake.txt"
                 );
             },
         )
@@ -462,7 +462,7 @@ mod external_command_arguments {
             "expands_table_of_primitives_to_positional_arguments",
             |dirs, sandbox| {
                 sandbox.with_files(vec![
-                    EmptyFile("jonathan_likes_cake.txt"),
+                    EmptyFile("jt_likes_cake.txt"),
                     EmptyFile("andres_likes_arepas.txt"),
                     EmptyFile("ferris_not_here.txt"),
                 ]);

tests/shell/pipeline/commands/internal.rs

@@ -11,7 +11,7 @@ fn takes_rows_of_nu_value_strings_and_pipes_it_to_stdin_of_external() {
             r#"
                 name,rusty_luck,origin
                 Jason,1,Canada
-                Jonathan,1,New Zealand
+                JT,1,New Zealand
                 Andrés,1,Ecuador
                 AndKitKatz,1,Estados Unidos
             "#,
@@ -103,7 +103,7 @@ fn subexpression_handles_dot() {
             r#"
                 name,rusty_luck,origin
                 Jason,1,Canada
-                Jonathan,1,New Zealand
+                JT,1,New Zealand
                 Andrés,1,Ecuador
                 AndKitKatz,1,Estados Unidos
             "#,