Further cleanup of Span::test_data usage + span fixes (#7595)

# Description

Inspired by #7592

For brevity use `Value::test_{string,int,float,bool}`

Includes fixes to commands that were abusing `Span::test_data` in their
implementation. Now the call span is used where possible or the explicit
`Span::unknonw` is used.

## Command fixes
- Fix abuse of `Span::test_data()` in `query_xml`
- Fix abuse of `Span::test_data()` in `term size`
- Fix abuse of `Span::test_data()` in `seq date`
- Fix two abuses of `Span::test_data` in `nu-cli`
- Change `Span::test_data` to `Span::unknown` in `keybindings listen`
- Add proper call span to `registry query`
- Fix span use in `nu_plugin_query`
- Fix span assignment in `select`
- Use `Span::unknown` instead of `test_data` in more places

## Other
- Use `Value::test_int`/`test_float()` consistently
- More `test_string` and `test_bool`
- Fix unused imports


# User-Facing Changes

Some commands may now provide more helpful spans for downstream use in
errors

crates/nu-command/src/platform/dir_info.rs

@@ -255,13 +255,13 @@ impl From<FileInfo> for Value {
         });
 
         cols.push("directories".into());
-        vals.push(Value::nothing(Span::test_data()));
+        vals.push(Value::nothing(Span::unknown()));
 
         cols.push("files".into());
-        vals.push(Value::nothing(Span::test_data()));
+        vals.push(Value::nothing(Span::unknown()));
 
         // cols.push("errors".into());
-        // vals.push(Value::nothing(Span::test_data()));
+        // vals.push(Value::nothing(Span::unknown()));
 
         Value::Record {
             cols,

crates/nu-command/src/platform/reedline_commands/keybindings_listen.rs

@@ -93,7 +93,7 @@ pub fn print_events(engine_state: &EngineState) -> Result<Value, ShellError> {
     }
     terminal::disable_raw_mode()?;
 
-    Ok(Value::nothing(Span::test_data()))
+    Ok(Value::nothing(Span::unknown()))
 }
 
 // this fn is totally ripped off from crossterm's examples
@@ -113,12 +113,12 @@ fn print_events_helper(event: Event) -> Result<Value, ShellError> {
                         "flags".into(),
                     ],
                     vals: vec![
-                        Value::string(format!("{}", c), Span::test_data()),
-                        Value::string(format!("{:#08x}", u32::from(c)), Span::test_data()),
-                        Value::string(format!("{:?}", modifiers), Span::test_data()),
-                        Value::string(format!("{:#08b}", modifiers), Span::test_data()),
+                        Value::string(format!("{}", c), Span::unknown()),
+                        Value::string(format!("{:#08x}", u32::from(c)), Span::unknown()),
+                        Value::string(format!("{:?}", modifiers), Span::unknown()),
+                        Value::string(format!("{:#08b}", modifiers), Span::unknown()),
                     ],
-                    span: Span::test_data(),
+                    span: Span::unknown(),
                 };
                 Ok(record)
             }
@@ -126,11 +126,11 @@ fn print_events_helper(event: Event) -> Result<Value, ShellError> {
                 let record = Value::Record {
                     cols: vec!["code".into(), "modifier".into(), "flags".into()],
                     vals: vec![
-                        Value::string(format!("{:?}", code), Span::test_data()),
-                        Value::string(format!("{:?}", modifiers), Span::test_data()),
-                        Value::string(format!("{:#08b}", modifiers), Span::test_data()),
+                        Value::string(format!("{:?}", code), Span::unknown()),
+                        Value::string(format!("{:?}", modifiers), Span::unknown()),
+                        Value::string(format!("{:#08b}", modifiers), Span::unknown()),
                     ],
-                    span: Span::test_data(),
+                    span: Span::unknown(),
                 };
                 Ok(record)
             }
@@ -138,8 +138,8 @@ fn print_events_helper(event: Event) -> Result<Value, ShellError> {
     } else {
         let record = Value::Record {
             cols: vec!["event".into()],
-            vals: vec![Value::string(format!("{:?}", event), Span::test_data())],
-            span: Span::test_data(),
+            vals: vec![Value::string(format!("{:?}", event), Span::unknown())],
+            span: Span::unknown(),
         };
         Ok(record)
     }

crates/nu-command/src/platform/term_size.rs

@@ -1,8 +1,6 @@
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, IntoPipelineData, PipelineData, Signature, Span, Type, Value,
-};
+use nu_protocol::{Category, Example, IntoPipelineData, PipelineData, Signature, Type, Value};
 use terminal_size::{terminal_size, Height, Width};
 
 #[derive(Clone)]
@@ -66,8 +64,8 @@ impl Command for TermSize {
         Ok(Value::Record {
             cols: vec!["columns".into(), "rows".into()],
             vals: vec![
-                Value::int(cols.0 as i64, Span::test_data()),
-                Value::int(rows.0 as i64, Span::test_data()),
+                Value::int(cols.0 as i64, head),
+                Value::int(rows.0 as i64, head),
             ],
             span: head,
         }