John Blackbourn 031e8ae457 Build/Test Tools: Fix CI for running tests on PHP 8.1.
This fixes the CI for PHP 8.1 while retaining the needed improvements for local testing when running `npm run test:php-composer` by:

* Replacing the npm script with the full node command
* Removing the `composer update` command from the `env:install` process

Props BinaryKitten, hellofromTonya

See #53945


git-svn-id: https://develop.svn.wordpress.org/trunk@51736 602fd350-edb4-49c9-b593-d223f7449a82
2021-09-07 19:22:57 +00:00
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