test: revert making test pub

Signed-off-by: Wei Zhang <[email protected]>

crates/tabby-index/src/code/intelligence.rs

@@ -246,7 +246,7 @@ mod metrics {
 }
 
 #[cfg(test)]
-pub mod tests {
+mod tests {
     use serial_test::file_serial;
     use tabby_common::path::set_tabby_root;
     use tracing_test::traced_test;