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/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());