Fix symbolic links not being overwritten during archive extraction

[Copilot]

When extracting an archive, existing symbolic links in the destination directory are not overwritten even when the archive contains a symlink with a different target.

// First extraction: creates symlink "link.txt -> target1.txt"
unarchiver.extract("archive1.tar");

// Second extraction: symlink still points to target1.txt (incorrect)
// Should now point to target2.txt
unarchiver.extract("archive2.tar");

Changes

• Replace FileUtils.resolveFile() with new File() in AbstractUnArchiver.extractFile() - the former follows symlinks, causing extraction to target the wrong file
• Check for symlinks before existence in shouldExtractEntry() - return true immediately for symlinks to enable overwriting
• Delete existing symlinks before creating new ones in symlink extraction path
• Update canonical path resolution to avoid following the final symlink component during security checks

Testing

Added testSymlinkOverwriteZip() and testSymlinkOverwriteTar() to verify symlinks are properly overwritten across archive formats.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Symbolic links are not overwritten when extracting archive</issue_title>
<issue_description>When extracting archive if a symbolic link already exist in the target directory it is not overwritten. It continues to point to the old file. This may cause issues if the symbolic link inside the archive points to a new file.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Symbolic links are not overwritten when extracting archive #140

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