Fix(tests): enable incremental sync for hybrid case (#13746)

* fix(tests): enable inc sync for 01-sync_spec.lua

* fix(incremental): dont delete old entity from LMDB if we clear it already

* dont modify crud type even though we dont delete old entity from lmdb

* localize ns_delta.wipe

* localize ns_delta.wipe - part 2

* fix that cp will not init clustering

* refactor old_entity logic

* cp should always support full sync protocol

* Revert "cp should always support full sync protocol"

This reverts commit 6803958.

* Revert "fix that cp will not init clustering"

This reverts commit b84f261.

* Revert "fix(tests): enable inc sync for 01-sync_spec.lua"

This reverts commit 54d0f54.

---------

Co-authored-by: chronolaw <chrono_cpp@me.com>

kong/clustering/services/sync/rpc.lua

@@ -219,7 +219,8 @@ local function do_sync()
 
   local t = txn.begin(512)
 
-  if ns_delta.wipe then
+  local wipe = ns_delta.wipe
+  if wipe then
     t:db_drop(false)
   end
 
@@ -242,15 +243,14 @@ local function do_sync()
         return nil, err
       end
 
-      local crud_event_type = "create"
+      local crud_event_type = old_entity and "update" or "create"
 
-      if old_entity then
+      -- If we will wipe lmdb, we don't need to delete it from lmdb.
+      if old_entity and not wipe then
         local res, err = delete_entity_for_txn(t, delta_type, old_entity, nil)
         if not res then
           return nil, err
         end
-
-        crud_event_type = "update"
       end
 
       local res, err = insert_entity_for_txn(t, delta_type, delta_row, nil)
@@ -267,7 +267,8 @@ local function do_sync()
         return nil, err
       end
 
-      if old_entity then
+      -- If we will wipe lmdb, we don't need to delete it from lmdb.
+      if old_entity and not wipe then
         local res, err = delete_entity_for_txn(t, delta_type, old_entity, nil)
         if not res then
           return nil, err
@@ -292,7 +293,7 @@ local function do_sync()
     return nil, err
   end
 
-  if ns_delta.wipe then
+  if wipe then
     kong.core_cache:purge()
     kong.cache:purge()