Add usage tracking for Setup Wizard Course Theme step

[alexsanford]

Fixes #6227

Changes proposed in this Pull Request

• Log an event when user chooses to install the Course Theme from the Setup Wizard.

Testing instructions

• Set up your testing environment to log usage tracking events. You can use event-monitor for this, or simply log to the error_log. Here is an example code snippet which does both.

add_filter( 'pre_http_request', function( $preempt, $r, $url ) {
  	$event_monitor_url = 'http://localhost:8888/pixel/';
  	$host              = parse_url( $url, PHP_URL_HOST );
  	$path              = parse_url( $url, PHP_URL_PATH );
  	if ( 'pixel.wp.com' === $host && '/t.gif' === $path ) {
  		error_log( 'Logging Tracks event:' );
  		error_log( $url );
  		
  		$http    = _wp_http_get_object();
  		$new_url = $event_monitor_url . '?' . parse_url( $url, PHP_URL_QUERY );

  		error_log( $new_url );

  		return $http->request( $new_url, $r );
  	}
  	return $preempt;
  }, 10, 3 );

• Walk through the Setup Wizard. Choose to install the theme. Ensure thesensei_setup_wizard_install_theme event is logged.
• Walk through the Setup Wizard again. Choose NOT to install the theme. Ensure the sensei_setup_wizard_install_theme event is not logged.

[codecov]

Codecov Report

Merging #6252 (85a5183) into feature/onboarding-theme-step (929889c) will decrease coverage by 0.00%.
The diff coverage is 59.67%.

@@                         Coverage Diff                         @@
##             feature/onboarding-theme-step    #6252      +/-   ##
===================================================================
- Coverage                            45.76%   45.76%   -0.01%     
- Complexity                            9483     9491       +8     
===================================================================
  Files                                  457      457              
  Lines                                33586    33621      +35     
  Branches                               274      274              
===================================================================
+ Hits                                 15370    15385      +15     
- Misses                               18011    18031      +20     
  Partials                               205      205              

Impacted Files	Coverage Δ
assets/admin/students/student-modal/course-list.js	76.00% <ø> (ø)
assets/setup-wizard/data/reducer.js	84.61% <ø> (ø)
includes/admin/class-sensei-setup-wizard.php	34.28% <ø> (ø)
.../admin/tools/class-sensei-tool-enrolment-debug.php	0.00% <0.00%> (ø)
includes/class-sensei-grading-main.php	0.00% <ø> (ø)
includes/class-sensei-grading.php	11.66% <0.00%> (ø)
includes/class-sensei-learner.php	46.54% <0.00%> (-1.58%)	⬇️
includes/class-sensei-lesson.php	37.11% <0.00%> (ø)
includes/class-sensei-modules.php	38.23% <0.00%> (ø)
includes/class-sensei-notices.php	60.00% <ø> (ø)
... and 11 more

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[jom]

Looks good and works well! I was wondering if it was worth firing the event when we didn't install the theme (with a null property or something), but I think this should be enough.