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/modeltestlib_test.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func CheckInt(t *testing.T, got int, expected int) {
+	assert.Equal(t, got, expected)
+}
+
+func CheckString(t *testing.T, got string, expected string) {
+	assert.Equal(t, got, expected)
+}
+
+func CheckTrue(t *testing.T, test bool) {
+	assert.True(t, test)
+}
+
+func CheckFalse(t *testing.T, test bool) {
+	assert.False(t, test)
+}