Test command names and search terms for redundancy (#6380)

* Test commands for proper names and search terms

Assert that the `Command.name()` is equal to `Signature.name`

Check that search terms are not just substrings of the command name as
they would not help finding the command.

* Clean up search terms

Remove redundant terms that just replicate the command name.
Try to eliminate substring between search terms, clean up where
necessary.

crates/nu-command/src/network/url/host.rs

@@ -26,7 +26,7 @@ impl Command for SubCommand {
     }
 
     fn search_terms(&self) -> Vec<&str> {
-        vec!["url", "host", "hostname"]
+        vec!["hostname"]
     }
 
     fn run(

crates/nu-command/src/network/url/path.rs

@@ -25,10 +25,6 @@ impl Command for SubCommand {
         "Get the path of a URL"
     }
 
-    fn search_terms(&self) -> Vec<&str> {
-        vec!["url", "path"]
-    }
-
     fn run(
         &self,
         engine_state: &EngineState,

crates/nu-command/src/network/url/query.rs

@@ -26,7 +26,7 @@ impl Command for SubCommand {
     }
 
     fn search_terms(&self) -> Vec<&str> {
-        vec!["url", "query", "parameter"]
+        vec!["parameter"]
     }
 
     fn run(

crates/nu-command/src/network/url/scheme.rs

@@ -26,7 +26,7 @@ impl Command for SubCommand {
     }
 
     fn search_terms(&self) -> Vec<&str> {
-        vec!["url", "scheme", "protocol"]
+        vec!["protocol"]
     }
 
     fn run(

crates/nu-command/src/network/url/url_.rs

@@ -22,7 +22,7 @@ impl Command for Url {
     }
 
     fn search_terms(&self) -> Vec<&str> {
-        vec!["url", "network", "parse"]
+        vec!["network", "parse"]
     }
 
     fn run(