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/scripts/config_generator/main.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/public/model"
 )
 
 // generateDefaultConfig writes default config to outputFile.

server/scripts/config_generator/main_test.go

@@ -8,7 +8,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/public/model"
 
 	"github.com/stretchr/testify/require"
 )

server/scripts/setup_go_work.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-
-if [[ $1 != "true" ]] ;
-then
-    echo "Creating a go.work file"
-
-    txt="go 1.19\n\nuse ./\n"
-    
-    if [ "$BUILD_ENTERPRISE_READY" == "true" ] 
-    then
-        txt="${txt}use ../../enterprise\n"
-    fi
-    
-    printf "$txt" > "go.work"
-fi