Add com.tivadar.best.socketio to embedded package build steps across all platforms

[Copilot]

The build workflow copies Best plugins as embedded Unity packages but was missing com.tivadar.best.socketio (Best SocketIO), which needs to be included alongside the other Best packages.

Changes

• Embedded package copy step — added com.tivadar.best.socketio to $embeddedPackages arrays (Windows Desktop, WebGL Compressed, WebGL Uncompressed, Android) and for pkg in loops (Mac, iOS)
• Cleanup steps — added corresponding Remove-Item (PowerShell) and rm -rf (bash) cleanup entries for com.tivadar.best.socketio on all platforms

# PowerShell (Windows/Android)
$embeddedPackages = @("com.occasoftware.super-simple-skybox", "com.tivadar.best.http", "com.tivadar.best.mqtt", "com.tivadar.best.websockets", "com.tivadar.best.socketio")

# Bash (Mac/iOS)
for pkg in "com.occasoftware.super-simple-skybox" "com.tivadar.best.http" "com.tivadar.best.mqtt" "com.tivadar.best.websockets" "com.tivadar.best.socketio"; do

[Copilot]

Pull request overview

This PR updates the GitHub Actions runtime build workflow to embed the com.tivadar.best.socketio Unity package (Best SocketIO) alongside the other Best packages, ensuring it is copied into the project during builds and cleaned up afterward across all supported platforms.

Changes:

• Added com.tivadar.best.socketio to the embedded package copy lists/loops for Windows Desktop, WebGL (compressed/uncompressed), Android, Mac, and iOS jobs.
• Added corresponding cleanup removals (Remove-Item / rm -rf) for the embedded package on all platforms.

Comments suppressed due to low confidence (1)

.github/workflows/build-runtime.yml:159

• In the embedded package copy loop, missing package directories are silently skipped (only copied if the source path exists). If these embedded packages are required for a correct build, consider failing the step (or at least logging a clear ::error::) when an expected package like com.tivadar.best.socketio is not found under UNITY_PACKAGES_PATH, to avoid producing builds without the intended embedded plugin.

          foreach ($pkg in $embeddedPackages) {
            $sourcePath = Join-Path $packagesPath $pkg
            $targetPath = Join-Path "$env:PROJECT_PATH\Packages" $pkg
            if (Test-Path $sourcePath) {
              if (Test-Path $targetPath) { Remove-Item -Recurse -Force $targetPath }
              New-Item -ItemType Directory -Path $targetPath -Force | Out-Null
              Copy-Item -Path "$sourcePath\*" -Destination $targetPath -Recurse -Force
              Write-Host "Copied $pkg"
            }

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[Copilot]

The embedded package list is duplicated across multiple jobs in this workflow (Windows/WebGL/Android PowerShell + Mac/iOS bash). Since this PR is fixing an omission caused by that duplication, consider centralizing the package list (e.g., YAML anchor or a single env var) so future package additions only need to be made in one place.