Build/Test Tools: Remove PHP requirement for the build script.

In [61873], the `build` script started failing in some environemnts due to logic that added a requirement for `php-cli`.

While WordPress itself cannot be run without PHP, the build script has never required PHP to be present to prepare `wordpress-develop` for use. This adjusts the relevant code to make use of the `php-array-reader` package instead.

Reviewed by peterwilsoncc.

Props dmsnell, peterwilsoncc, gaisma22, SirLouen, sabernhardt, manhar.
Fixes #64925. See #64393.

git-svn-id: https://develop.svn.wordpress.org/trunk@62157 602fd350-edb4-49c9-b593-d223f7449a82