v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/model/feature_flags.go

@@ -0,0 +1,157 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"reflect"
+	"strconv"
+)
+
+type FeatureFlags struct {
+	// Exists only for unit and manual testing.
+	// When set to a value, will be returned by the ping endpoint.
+	TestFeature string
+	// Exists only for testing bool functionality. Boolean feature flags interpret "on" or "true" as true and
+	// all other values as false.
+	TestBoolFeature bool
+
+	// Enable the remote cluster service for shared channels.
+	EnableRemoteClusterService bool
+
+	// AppsEnabled toggles the Apps framework functionalities both in server and client side
+	AppsEnabled bool
+
+	// Feature flags to control plugin versions
+	PluginPlaybooks  string `plugin_id:"playbooks"`
+	PluginApps       string `plugin_id:"com.mattermost.apps"`
+	PluginFocalboard string `plugin_id:"focalboard"`
+	PluginCalls      string `plugin_id:"com.mattermost.calls"`
+
+	PermalinkPreviews bool
+
+	// CallsEnabled controls whether or not the Calls plugin should be enabled
+	CallsEnabled bool
+
+	// A dash separated list for feature flags to turn on for Boards
+	BoardsFeatureFlags string
+
+	// Enable DataRetention for Boards
+	BoardsDataRetention bool
+
+	NormalizeLdapDNs bool
+
+	// Enable special onboarding flow for first admin
+	UseCaseOnboarding bool
+
+	// Enable GraphQL feature
+	GraphQL bool
+
+	InsightsEnabled bool
+
+	CommandPalette bool
+
+	// A/B Test on posting a welcome message
+	SendWelcomePost bool
+
+	WorkTemplate bool
+
+	PostPriority bool
+
+	// Enable WYSIWYG text editor
+	WysiwygEditor bool
+
+	PeopleProduct bool
+
+	// A/B Test on reduced onboarding task list item
+	ReduceOnBoardingTaskList bool
+
+	// A/B Test to control when to show onboarding linked board
+	OnboardingAutoShowLinkedBoard bool
+
+	ThreadsEverywhere bool
+
+	GlobalDrafts bool
+
+	OnboardingTourTips bool
+
+	DeprecateCloudFree bool
+
+	AppsSidebarCategory bool
+
+	CloudReverseTrial bool
+}
+
+func (f *FeatureFlags) SetDefaults() {
+	f.TestFeature = "off"
+	f.TestBoolFeature = false
+	f.EnableRemoteClusterService = false
+	f.AppsEnabled = true
+	f.PluginApps = ""
+	f.PluginFocalboard = ""
+	f.PermalinkPreviews = true
+	f.BoardsFeatureFlags = ""
+	f.BoardsDataRetention = false
+	f.NormalizeLdapDNs = false
+	f.UseCaseOnboarding = true
+	f.GraphQL = false
+	f.InsightsEnabled = true
+	f.CommandPalette = false
+	f.CallsEnabled = true
+	f.SendWelcomePost = true
+	f.PostPriority = true
+	f.PeopleProduct = false
+	f.WorkTemplate = true
+	f.ReduceOnBoardingTaskList = false
+	f.ThreadsEverywhere = false
+	f.GlobalDrafts = true
+	f.DeprecateCloudFree = false
+	f.WysiwygEditor = false
+	f.OnboardingAutoShowLinkedBoard = false
+	f.OnboardingTourTips = true
+	f.AppsSidebarCategory = false
+	f.CloudReverseTrial = false
+}
+
+func (f *FeatureFlags) Plugins() map[string]string {
+	rFFVal := reflect.ValueOf(f).Elem()
+	rFFType := reflect.TypeOf(f).Elem()
+
+	pluginVersions := make(map[string]string)
+	for i := 0; i < rFFVal.NumField(); i++ {
+		rFieldVal := rFFVal.Field(i)
+		rFieldType := rFFType.Field(i)
+
+		pluginId, hasPluginId := rFieldType.Tag.Lookup("plugin_id")
+		if !hasPluginId {
+			continue
+		}
+
+		pluginVersions[pluginId] = rFieldVal.String()
+	}
+
+	return pluginVersions
+}
+
+// ToMap returns the feature flags as a map[string]string
+// Supports boolean and string feature flags.
+func (f *FeatureFlags) ToMap() map[string]string {
+	refStructVal := reflect.ValueOf(*f)
+	refStructType := reflect.TypeOf(*f)
+	ret := make(map[string]string)
+	for i := 0; i < refStructVal.NumField(); i++ {
+		refFieldVal := refStructVal.Field(i)
+		if !refFieldVal.IsValid() {
+			continue
+		}
+		refFieldType := refStructType.Field(i)
+		switch refFieldType.Type.Kind() {
+		case reflect.Bool:
+			ret[refFieldType.Name] = strconv.FormatBool(refFieldVal.Bool())
+		default:
+			ret[refFieldType.Name] = refFieldVal.String()
+		}
+	}
+
+	return ret
+}