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_test.go

@@ -0,0 +1,54 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFeatureFlagsToMap(t *testing.T) {
+	for name, tc := range map[string]struct {
+		Flags            FeatureFlags
+		TestFeatureValue string
+	}{
+		"empty": {
+			TestFeatureValue: "",
+			Flags:            FeatureFlags{},
+		},
+		"simple value": {
+			TestFeatureValue: "expectedvalue",
+			Flags:            FeatureFlags{TestFeature: "expectedvalue"},
+		},
+		"empty value": {
+			TestFeatureValue: "",
+			Flags:            FeatureFlags{TestFeature: ""},
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tc.TestFeatureValue, tc.Flags.ToMap()["TestFeature"])
+		})
+	}
+}
+
+func TestFeatureFlagsToMapBool(t *testing.T) {
+	for name, tc := range map[string]struct {
+		Flags            FeatureFlags
+		TestFeatureValue string
+	}{
+		"false": {
+			TestFeatureValue: "false",
+			Flags:            FeatureFlags{},
+		},
+		"true": {
+			TestFeatureValue: "true",
+			Flags:            FeatureFlags{TestBoolFeature: true},
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tc.TestFeatureValue, tc.Flags.ToMap()["TestBoolFeature"])
+		})
+	}
+}