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/emoji_test.go

@@ -0,0 +1,64 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEmojiIsValid(t *testing.T) {
+	emoji := Emoji{
+		Id:        NewId(),
+		CreateAt:  1234,
+		UpdateAt:  1234,
+		DeleteAt:  0,
+		CreatorId: NewId(),
+		Name:      "name",
+	}
+
+	require.Nil(t, emoji.IsValid())
+
+	emoji.Id = "1234"
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.Id = NewId()
+	emoji.CreateAt = 0
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.CreateAt = 1234
+	emoji.UpdateAt = 0
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.UpdateAt = 1234
+	emoji.CreatorId = strings.Repeat("1", 27)
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.CreatorId = NewId()
+	emoji.Name = strings.Repeat("1", 65)
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.Name = ""
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.Name = strings.Repeat("1", 64)
+	require.Nil(t, emoji.IsValid())
+
+	emoji.Name = "name-"
+	require.Nil(t, emoji.IsValid())
+
+	emoji.Name = "name+"
+	require.Nil(t, emoji.IsValid())
+
+	emoji.Name = "name_"
+	require.Nil(t, emoji.IsValid())
+
+	emoji.Name = "name:"
+	require.NotNil(t, emoji.IsValid())
+
+	emoji.Name = "croissant"
+	require.NotNil(t, emoji.IsValid())
+}