Stable Branch Fix perl-DBD-MySQL exclusion symlink handling with repair logic in 13…

Fix perl-DBD-MySQL exclusion symlink handling with repair logic in 132.00stable

Enhances manage_perl_dbd_mysql_exclude() function to handle /etc/yum.conf symlinks:
- Detects and repairs broken symlinks on EL8/9/10 systems (skips EL7 which uses regular file)
- Resolves symlinks with readlink -f to prevent sed -i from breaking them
- Merges existing exclusions when repairing broken symlinks
- Forces DNF metadata cache refresh after config changes
- Preserves symlink integrity during yum.conf modifications

Fixes issue where sed -i replaced /etc/yum.conf symlink with regular file,
causing DNF to ignore perl-DBD-MySQL exclusions in /etc/dnf/dnf.conf

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132.00stable branch

• Branch: https://github.com/centminmod/centminmod/tree/132.00stable
• Commit History: https://github.com/centminmod/centminmod/commits/132.00stable

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