test: sqlness upgrade compatibility tests (#5126)

* feat: simple version switch

* chore: remove debug print

* chore: add common folder

* tests: add drop table

* feat: pull versioned binary

* chore: don't use native-tls

* chore: rm outdated docs

* chore: new line

* fix: save old bin dir

* fix: switch version restart all node

* feat: use etcd

* fix: wait for election

* fix: normal sqlness

* refactor: hashmap for bin dir

* test: past 3 major version compat crate table

* refactor: allow using without setup etcd

src/common/meta/src/kv_backend/etcd.rs

@@ -15,6 +15,7 @@
 use std::any::Any;
 use std::sync::Arc;
 
+use common_telemetry::info;
 use etcd_client::{
     Client, DeleteOptions, GetOptions, PutOptions, Txn, TxnOp, TxnOpResponse, TxnResponse,
 };
@@ -55,6 +56,7 @@ impl EtcdStore {
     }
 
     pub fn with_etcd_client(client: Client, max_txn_ops: usize) -> KvBackendRef {
+        info!("Connected to etcd");
         Arc::new(Self {
             client,
             max_txn_ops,