Create a Husky pre-commit hook to update the Playground docker image version

[elchininet]

Every time that the @playwright/test is updated, the .playwright_docker_version gets outdated. If it is a patch update nothing happens, but if it is a major/minor update multiple times the tests fail because the versin of the Docker image and the version of the package don't match, so a manual work is required in those cases. This is pretty common during Dependabot updates.

This pull request creates a small Husky hook before any commit to check if the @playwright/test package has been updated. If the package has been updated, it updates the .playwright_docker_version file with the proper version and add it to the commit changes.

[coveralls]

coverage: 100.0%. remained the same
when pulling 443d79e on create_husky_pre_commit_hook
into 3747fb5 on master.