Always emit plugin.js into plugin repository

[volterra79]

Copy plugin.js compiled file into plugin code folder to allow npm run build and choose plugin to copy to admin folder

[github-actions]

The backport to v3.11.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-v3.11.x v3.11.x
# Navigate to the new working tree
cd .worktrees/backport-v3.11.x
# Create a new branch
git switch --create backport-725-to-v3.11.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 7b361cd57a64a12c0efa86852553d16b1821ad42
# Push it to GitHub
git push --set-upstream origin backport-725-to-v3.11.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-v3.11.x

Then, create a pull request where the base branch is v3.11.x and the compare/head branch is backport-725-to-v3.11.x.