package json versioning is done directly.

This MR introduces several changes in build procedure: there is no need to call a bump_npm_version.sh script at begin since TS/JS package.json exists (like also contains semver compliant version placeholder). Also it adds a pre-commit hook to prevent overwriting version placeholders in this file by accident commits. Additionally, due to high CI overhead caused by large npm package installation, preconfigured emscripten image has been extended by preinstalled pnpm and PlayWright environments.