server/public/ -- pre-requisite changes (#23278)

* invert depdendency: filestore -> model

* markdown: nolint:misspell

* inline jsonutils within model

* push model.GetInfoForBytes -> channels/app

* push channel/utils.CompileGo* -> plugin/utils

* push plugin/scheduler -> channels/jobs/plugins

* push utils.Copy(File|Dir) -> model

* oauthproiders/gitlab -> channels/app/oauthproviders/gitlab

* decouple plugin from einterfaces.MetricsInterface

* fix TestGetInfoForFile

* Revert "Run golangci in server CI (#23240)"

This reverts commit 349e5d4573.

* add model/utils

---------

Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>

server/plugin/utils/test_files_compiler.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package utils
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func CompileGo(t *testing.T, sourceCode, outputPath string) {
+	dir, err := os.MkdirTemp(".", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	dir, err = filepath.Abs(dir)
+	require.NoError(t, err)
+
+	// Write out main.go given the source code.
+	main := filepath.Join(dir, "main.go")
+	err = os.WriteFile(main, []byte(sourceCode), 0600)
+	require.NoError(t, err)
+
+	_, sourceFile, _, ok := runtime.Caller(0)
+	require.True(t, ok)
+	serverPath := filepath.Dir(filepath.Dir(sourceFile))
+
+	out := &bytes.Buffer{}
+	cmd := exec.Command("go", "build", "-o", outputPath, main)
+	cmd.Dir = serverPath
+	cmd.Stdout = out
+	cmd.Stderr = out
+	err = cmd.Run()
+	if err != nil {
+		t.Log("Go compile errors:\n", out.String())
+	}
+	require.NoError(t, err, "failed to compile go")
+}
+
+func CompileGoTest(t *testing.T, sourceCode, outputPath string) {
+	dir, err := os.MkdirTemp(".", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	dir, err = filepath.Abs(dir)
+	require.NoError(t, err)
+
+	// Write out main.go given the source code.
+	main := filepath.Join(dir, "main_test.go")
+	err = os.WriteFile(main, []byte(sourceCode), 0600)
+	require.NoError(t, err)
+
+	_, sourceFile, _, ok := runtime.Caller(0)
+	require.True(t, ok)
+	serverPath := filepath.Dir(filepath.Dir(sourceFile))
+
+	out := &bytes.Buffer{}
+	cmd := exec.Command("go", "test", "-c", "-o", outputPath, main)
+	cmd.Dir = serverPath
+	cmd.Stdout = out
+	cmd.Stderr = out
+	err = cmd.Run()
+	if err != nil {
+		t.Log("Go compile errors:\n", out.String())
+	}
+	require.NoError(t, err, "failed to compile go")
+}