PHP CI builds failing after adding infrastructure tags

The PHP builds (php81, php82, php83, php-release) are failing in CI (presubmit) after the changes to add $COMMIT_SHA tags were introduced in #568.

The failure occurs during the docker build process for PHP images.
Due to these failures, we are temporarily reverting the PHP changes in #568 to allow other language images to land.

This issue tracks fixing the PHP build failures so we can re-introduce the infrastructure tags for PHP.

Failed Build Link: https://console.cloud.google.com/cloud-build/builds/0e371280-3056-4c40-af6f-f6f7c08a2cfb?project=250644331956