Record parent slot to reconstruct fork tree from influxdb (#18482) (#18488)

(cherry picked from commit d69f469b83)

Co-authored-by: Ryo Onodera <ryoqun@gmail.com>

runtime/src/bank.rs

@@ -1229,7 +1229,8 @@ impl Bank {
         datapoint_info!(
             "bank-new_from_parent-heights",
             ("slot_height", slot, i64),
-            ("block_height", new.block_height, i64)
+            ("block_height", new.block_height, i64),
+            ("parent_slot_height", parent.slot(), i64),
         );
 
         let mut ancestors = Vec::with_capacity(1 + new.parents().len());