Respect ensure when managing xtrabackup backup package

[milad-zanganeh]

Summary

Fixes mysql::backup::xtrabackup so that the backup method package and backup directory are removed when the class is declared with ensure => absent.

Additional Context

• Root cause and the steps to reproduce.
  • Root cause: stdlib::ensure_packages($backupmethod_package) was called without an options hash, defaulting the package to ensure => present regardless of the class $ensure parameter.
  • The $backupdir file resource was hardcoded to ensure => 'directory', which ignores the class's $ensure parameter.
  • Reproduce: Declare mysql::server::backup (with backupmethod => 'xtrabackup') and ensure => absent, run puppet apply, and observe that the backup method package remains installed and still manages the backup directory.
• Thought process behind the implementation.
  • The class already exposes an $ensure parameter (Enum['present', 'absent']) used for the other backup resources. Passing it through to stdlib::ensure_packages and file makes the package and directory lifecycle consistent with the rest of the backup resources without introducing a new parameter.

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