create filter to enable use of custom directory copy code #3791
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Instead of the custom conditional for testing Rollback, add a filter hook that enables the ability to use custom code in place of
copy_dir()inWP_Upgrader::install_package().Filter sets callback function to use for directory copy.
Trac ticket: https://core.trac.wordpress.org/ticket/56057
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.