Fix default topology name - should be standalone (#5130)

* Fix default topology name - should be standalone

* revert gh actions changes

* note topology: server

* repair make-github-actions

Co-authored-by: Oleg Pudeyev <code@olegp.name>

Author: p-mongo

.evergreen/functions.sh

@@ -9,7 +9,7 @@ set_env_vars() {
   AUTH=${AUTH:-noauth}
   SSL=${SSL:-nossl}
   MONGODB_URI=${MONGODB_URI:-}
-  TOPOLOGY=${TOPOLOGY:-server}
+  TOPOLOGY=${TOPOLOGY:-standalone}
   DRIVERS_TOOLS=${DRIVERS_TOOLS:-}
 
   if [ "$AUTH" != "noauth" ]; then

.evergreen/make-github-actions

@@ -4,7 +4,13 @@
 # TODO: Support i18n-fallbacks test
 # TODO: Support app-tests tests
 
+# Note on topology: server:
+# The GH actions use mongo-orchestration, which uses a "server" topology for
+# the standalone one. See transform_node! below for the mapping of all
+# topologies.
+
 require 'fileutils'
+require 'active_support'
 require 'active_support/dependencies/autoload'
 require 'active_support/core_ext'
 require 'yaml'
@@ -240,7 +246,7 @@ class Transmogrifier
 
   def step_mongodb
     {
-      id: "start-mongodb"
+      id: "start-mongodb",
       name: "start mongodb",
       uses: "mongodb-labs/drivers-evergreen-tools@master",
       with: {