Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/public/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"])
+		})
+	}
+}