RPM `filelist.xml` updater

What does this MR do and why?

Extends BuildFilelistXml builder services with build_new_node function to update existed xml files with metadata from new packages.

Screenshots or screen recordings

How to set up and validate locally

1. Generate empty xml

empty = Packages::Rpm::RepositoryMetadata::UpdateXmlService.new(filename: :filelist).execute

2. Set variable with parsed RPM package metadata

data = {files: ['test', '/urs/test', '/user/.test', 'test.js', '/urs/test.js', '/user/test.html.erb']}

3. Call service again passing empty xml and data

Packages::Rpm::RepositoryMetadata::BuildFilelistXmlService.new(data).execute

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #372652 (closed)