MM 50960 - Add company name and invite members pages to preparing-workspace for self-hosted (#22838)

* MM-50960 - store system organization name

* restore the preparing workspace plugins and invite screens

* add back the page lines for the design

* add lines back and organize styles

* set back documentation to monorepo style and disable board as a product

* fix organization link and style skip button

* create team on organization name screen continue button click

* make sure there are not already created team and if so just update team name

* update the team display name if team has already been created

* cover error scenarios during team creation

* add pr feedback and add a couple of unit tests

* fix translation server error; make sure only update display name if it has changed in the form

* temp advances

* rewrite unit tests using react-testing library; fix unit tests

* fix translations

* make sure the launching workspace finish in cloud installations

* remove redundant validation

* fix unit tests

* remove unintended config value left after merge conflict

server/channels/app/onboarding_test.go

@@ -0,0 +1,30 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/server/v8/channels/app/request"
+	mm_model "github.com/mattermost/mattermost-server/server/v8/model"
+)
+
+func TestOnboardingSavesOrganizationName(t *testing.T) {
+	th := Setup(t)
+	defer th.TearDown()
+
+	err := th.App.CompleteOnboarding(&request.Context{}, &mm_model.CompleteOnboardingRequest{
+		Organization: "Mattermost In Tests",
+	})
+	require.Nil(t, err)
+	defer func() {
+		th.App.Srv().Store().System().PermanentDeleteByName(mm_model.SystemOrganizationName)
+	}()
+
+	sys, storeErr := th.App.Srv().Store().System().GetByName(mm_model.SystemOrganizationName)
+	require.NoError(t, storeErr)
+	require.Equal(t, "Mattermost In Tests", sys.Value)
+}