Includes mmctl into the mono-repo (#23091)

* Includes mmctl into the mono-repo

* Update to use the new public module paths

* Adds docs check to the mmctl CI

* Fix public utils import path

* Tidy up modules

* Fix linter

* Update CI tasks to use the new file structure

* Update CI references

server/cmd/mmctl/commands/errors.go

@@ -0,0 +1,52 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package commands
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/mattermost/mattermost-server/server/public/model"
+)
+
+// ErrEntityNotFound is thrown when an entity (user, team, etc.)
+// is not found, returning the id sent by arguments
+type ErrEntityNotFound struct {
+	Type string
+	ID   string
+}
+
+func (e ErrEntityNotFound) Error() string {
+	return fmt.Sprintf("%s %s not found", e.Type, e.ID)
+}
+
+type NotFoundError struct {
+	Msg string
+}
+
+func (e *NotFoundError) Error() string {
+	return e.Msg
+}
+
+type BadRequestError struct {
+	Msg string
+}
+
+func (e *BadRequestError) Error() string {
+	return e.Msg
+}
+
+// ExtractErrorFromResponse extracts the error from the response,
+// encapsulating it if matches the common cases, such as when it's
+// not found, and when we've made a bad request
+func ExtractErrorFromResponse(r *model.Response, err error) error {
+	switch r.StatusCode {
+	case http.StatusNotFound:
+		return &NotFoundError{Msg: err.Error()}
+	case http.StatusBadRequest:
+		return &BadRequestError{Msg: err.Error()}
+	default:
+		return err
+	}
+}