Add course and site metadata for the tasks attribute on sensei home endpoint

[fjorgemota]

trafficstars

Fixes #5930

Changes proposed in this Pull Request

• Add "course" and "site" metadata to the "tasks" object in the endpoint for Sensei Home;
• Add unit tests to check that;

Testing instructions

On a WP installation containing Sensei LMS on this branch:

1. Run curl --user "user:application password" http://your-host/wp-json/sensei-internal/v1/home | jq .tasks and make sure the "site" object includes the title of the site you're acessing, and the URL to a custom logo if one is defined (or null, if none is defined);
2. Add a custom logo to the site and verify if the image is linked there;
3. Now, import the sample course, and verify if that the "course" attribute is still null;
4. Now, create another course, and verify if the course title you just created appears on the course object, in the attribute title;
5. Add a featured image to the course you just created, and verify if the link to the image appears correctly in the course object, in the attribute image;
6. Finally, move the course to the trash, and verify if the course attribute returns null again;

[codecov[bot]]

Codecov Report

Merging #5936 (9733db5) into feature/new-onboarding-experience (541edc2) will increase coverage by 0.16%. The diff coverage is 100.00%.

:exclamation: Current head 9733db5 differs from pull request most recent head 6fd79f5. Consider uploading reports for the commit 6fd79f5 to get more accurate results

@@                           Coverage Diff                           @@
##             feature/new-onboarding-experience    #5936      +/-   ##
=======================================================================
+ Coverage                                43.83%   44.00%   +0.16%     
- Complexity                                9143     9190      +47     
=======================================================================
  Files                                      439      441       +2     
  Lines                                    32521    32702     +181     
  Branches                                   252      252              
=======================================================================
+ Hits                                     14257    14389     +132     
- Misses                                   18078    18127      +49     
  Partials                                   186      186              

Impacted Files	Coverage Δ
...in/home/tasks/class-sensei-home-tasks-provider.php	100.00% <100.00%> (ø)
includes/admin/class-sensei-home.php	0.00% <0.00%> (-11.87%)	:arrow_down:
includes/admin/class-sensei-admin-notices.php	48.41% <0.00%> (-3.48%)	:arrow_down:
...cludes/rest-api/class-sensei-rest-api-internal.php	67.56% <0.00%> (-1.01%)	:arrow_down:
includes/class-sensei-autoloader.php	14.58% <0.00%> (-0.32%)	:arrow_down:
includes/class-sensei-admin.php	22.26% <0.00%> (-0.09%)	:arrow_down:
includes/class-sensei.php	27.49% <0.00%> (-0.07%)	:arrow_down:
...des/admin/home/class-sensei-home-news-provider.php	100.00% <0.00%> (ø)
...s/admin/home/class-sensei-home-guides-provider.php	100.00% <0.00%> (ø)
...s/admin/home/class-sensei-home-remote-data-api.php	95.08% <0.00%> (ø)
... and 3 more

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