[MM-25648] api4: add user/bot convert endpoints (#14877)

* api4: add user/bot convert endpoints

* api4: add convert user/bot to local mode

* api4: fix linting issues

* api4/bot: reflect review comments

* api4: update convert user endpoint paths

* remove shadow decl

* fix translation problems

api4/user_test.go

@@ -5075,3 +5075,29 @@ func TestPublishUserTyping(t *testing.T) {
 		CheckServiceUnavailableStatus(t, resp)
 	})
 }
+
+func TestConvertUserToBot(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	bot, resp := th.Client.ConvertUserToBot(th.BasicUser.Id)
+	CheckForbiddenStatus(t, resp)
+	require.Nil(t, bot)
+
+	th.TestForSystemAdminAndLocal(t, func(t *testing.T, client *model.Client4) {
+		user := model.User{Email: th.GenerateTestEmail(), Username: GenerateTestUsername(), Password: "password"}
+
+		ruser, resp := client.CreateUser(&user)
+		CheckNoError(t, resp)
+		CheckCreatedStatus(t, resp)
+
+		bot, resp = client.ConvertUserToBot(ruser.Id)
+		CheckNoError(t, resp)
+		require.NotNil(t, bot)
+		require.Equal(t, bot.UserId, ruser.Id)
+
+		bot, resp = client.GetBot(bot.UserId, "")
+		CheckNoError(t, resp)
+		require.NotNil(t, bot)
+	})
+}