Prevent empty installer directory creation in build script

[Copilot]

The move-vsix-to-installer.js build script unconditionally created the installer directory, even when no .vsix files existed to move.

Changes

• Collect .vsix files before directory creation
• Only create installer directory when files exist to move (vsixFiles.length > 0)

Before:

if (!fs.existsSync(installerDir)) {
    fs.mkdirSync(installerDir);
}
fs.readdirSync('.').filter(f => f.endsWith('.vsix')).forEach(...)

After:

const vsixFiles = fs.readdirSync('.').filter(f => f.endsWith('.vsix'));
if (vsixFiles.length > 0) {
    if (!fs.existsSync(installerDir)) {
        fs.mkdirSync(installerDir);
    }
    vsixFiles.forEach(...)
}

Original prompt

add files from logs only if folders contains any files

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