Remove test class references from main codebase

[caendesilva]

We've had a lot of links to test classes, which has been useful for the rapid development, but look pretty ugly in the actual downstream code. This PR removes them.

[codecov]

Codecov Report

Merging #1287 (584b33f) into master (251e042) will not change coverage.
The diff coverage is n/a.

❗ Current head 584b33f differs from pull request most recent head 287f54f. Consider uploading reports for the commit 287f54f to get more accurate results

@@              Coverage Diff              @@
##              master     #1287     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1316      2632   +1316     
=============================================
  Files            152       304    +152     
  Lines           3451      6902   +3451     
=============================================
+ Hits            3451      6902   +3451     

Impacted Files	Coverage Δ
...ework/src/Console/Commands/BuildRssFeedCommand.php	100.00% <ø> (ø)
...mework/src/Console/Commands/BuildSearchCommand.php	100.00% <ø> (ø)
...ramework/src/Console/Commands/BuildSiteCommand.php	100.00% <ø> (ø)
...ework/src/Console/Commands/BuildSitemapCommand.php	100.00% <ø> (ø)
.../Console/Commands/ChangeSourceDirectoryCommand.php	100.00% <ø> (ø)
...framework/src/Console/Commands/MakePageCommand.php	100.00% <ø> (ø)
...rk/src/Console/Commands/PackageDiscoverCommand.php	100.00% <ø> (ø)
...ork/src/Console/Commands/PublishConfigsCommand.php	100.00% <ø> (ø)
...rk/src/Console/Commands/PublishHomepageCommand.php	100.00% <ø> (ø)
...ework/src/Console/Commands/PublishViewsCommand.php	100.00% <ø> (ø)
... and 64 more

... and 152 files with indirect coverage changes

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