Update "arc liberate" to fix error with PHP 8 and add "--verbose" argument to adjust it

Summary:
Reported at the phorge project (https://we.phorge.it/D25017), running arc liberate fails on PHP 8 due to the log() function using fwrite() incorrectly assuming a format pattern can be used.

This updates to remove most of these status messages are they are largely uninformative and instead we can report progress.

• Remove the --quiet argument
• Always display the progress
• Remove all informational/status log statements

Test Plan:
Tested using both PHP 7.3 and PHP 8:

1. I ran arc liberate and saw the standard output:

 SCAN  Searching for libraries in the current working directory...
 WORK  Updating library: src/
Done.
 DONE  Updated library.

2. I ran deleted phabricator/src/.phutil_module_cache and ran arc liberate /src, verifying that progress was displayed while the map was computed.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D21718