Goodbye, GraphQL (#24827)

```release-note
NONE
```

server/public/shared/mlog/graphql.go

@@ -1,23 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-package mlog
-
-import (
-	"context"
-)
-
-// GraphQLLogger is used to log panics that occur during query execution.
-type GraphQLLogger struct {
-	logger *Logger
-}
-
-func NewGraphQLLogger(logger *Logger) *GraphQLLogger {
-	return &GraphQLLogger{logger: logger}
-}
-
-// LogPanic satisfies the graphql/log.Logger interface.
-// It converts the panic into an error.
-func (l *GraphQLLogger) LogPanic(_ context.Context, value any) {
-	l.logger.Error("Error while executing GraphQL query", Any("error", value))
-}