Only create installer directory when .vsix files exist

[Copilot]

The build script was creating an empty installer/ directory unconditionally during package builds, even when no .vsix files were present to move.

Changes

• Collect .vsix files before directory creation
• Gate installer/ directory creation on vsixFiles.length > 0
• Move file processing inside conditional block

// Before: always creates installer/
if (!fs.existsSync(installerDir)) {
    fs.mkdirSync(installerDir);
}
fs.readdirSync('.').filter(f => f.endsWith('.vsix')).forEach(...)

// After: only creates installer/ when needed
const vsixFiles = fs.readdirSync('.').filter(f => f.endsWith('.vsix'));
if (vsixFiles.length > 0) {
    if (!fs.existsSync(installerDir)) {
        fs.mkdirSync(installerDir);
    }
    vsixFiles.forEach(...)
}

Original prompt

only add if logs contains files

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