Feature cleanup (#7182)

Following up on #7180 with some feature cleanup:

- Move the `database` feature from `plugin` to `default`
- Rename the `database` feature to `sqlite`
- Remove `--features=extra` from a lot of scripts etc. 
- No need to specify this, the `extra` feature is now the same as the
default feature set
- Remove the now-redundant 2nd Ubuntu test run

crates/nu-command/src/core_commands/version.rs

@@ -193,7 +193,7 @@ fn features_enabled() -> Vec<String> {
         names.push("trash".to_string());
     }
 
-    #[cfg(feature = "database")]
+    #[cfg(feature = "sqlite")]
     {
         names.push("database".to_string());
     }

crates/nu-command/src/default_context.rs

@@ -23,7 +23,7 @@ pub fn create_default_context() -> EngineState {
 
         // Database-related
         // Adds all related commands to query databases
-        #[cfg(feature = "database")]
+        #[cfg(feature = "sqlite")]
         add_database_decls(&mut working_set);
 
         // Core

crates/nu-command/src/filesystem/open.rs

@@ -7,10 +7,10 @@ use nu_protocol::{
 };
 use std::io::BufReader;
 
-#[cfg(feature = "database")]
+#[cfg(feature = "sqlite")]
 use crate::database::SQLiteDatabase;
 
-#[cfg(feature = "database")]
+#[cfg(feature = "sqlite")]
 use nu_protocol::IntoPipelineData;
 
 #[cfg(unix)]
@@ -107,7 +107,7 @@ impl Command for Open {
                 Vec::new(),
             ))
         } else {
-            #[cfg(feature = "database")]
+            #[cfg(feature = "sqlite")]
             if !raw {
                 let res = SQLiteDatabase::try_from_path(path, arg_span)
                     .map(|db| db.into_value(call.head).into_pipeline_data());

crates/nu-command/src/lib.rs

@@ -62,8 +62,8 @@ mod dataframe;
 #[cfg(feature = "dataframe")]
 pub use dataframe::*;
 
-#[cfg(feature = "database")]
+#[cfg(feature = "sqlite")]
 mod database;
 
-#[cfg(feature = "database")]
+#[cfg(feature = "sqlite")]
 pub use database::*;