Duplicate code for parsing a filename from the content-disposition header for file uploads is deprecated

[github-actions]

https://www.drupal.org/node/3380380

Introduced in branch/version: 10.3.x / 10.3.0

A new static method for parsing a filename from the content-disposition header for file uploads has been added.

For example:

use Symfony\Component\HttpFoundation\Request;
$filename = ContentDispositionFilenameParser::parseFilename($request)

This deprecates two duplicate methods in REST and JSON API modules:

• \Drupal\jsonapi\Controller\TemporaryJsonapiFileFieldUploader::validateAndParseContentDispositionHeader()
• \Drupal\file\Plugin\rest\resource\FileUploadResource::validateAndParseContentDispositionHeader()