Point PHP-FPM error_log to user directory

[drbyte]

Point PHP-FPM error_log to user directory

Old: /usr/local/var/log/php-fpm.log
New: ~/.config/valet/Log/php-fpm.log

(We already put ~/.config/valet/Log/nginx-error.log in this same directory.)

This avoids ARM Mac differences in directory paths (eg: /usr/local/ isn't a default anymore).
It also makes it easier for the User to find/access these logs.

Addendum to #992 discussion at #992 (review)

[drbyte]

Hmmm ... maybe needs some discussion about other log files as well:

valet/cli/valet.php

Lines 481 to 487 in 21f0549

	$app->command('log [-f|--follow] [-l|--lines=] [key]', function ($follow, $lines, $key = null) {
	$defaultLogs = [
	'php-fpm' => BREW_PREFIX.'/var/log/php-fpm.log',
	'nginx' => VALET_HOME_PATH.'/Log/nginx-error.log',
	'mailhog' => BREW_PREFIX.'/var/log/mailhog.log',
	'redis' => BREW_PREFIX.'/var/log/redis.log',
	];

... noting that redirecting those to another place requires adding more configuration that Valet doesn't already manage. Kinda prefer to avoid adding the complexity.