- Adds `WP_REST_Autosaves_Controller` which extends `WP_REST_Revisions_Controller`.
- Autosaves endpoint is registered for all post types except attachment because even post types without revisions enabled are expected to autosave.
- Because setting the `DOING_AUTOSAVE` constant pollutes the test suite, autosaves tests are run last. We may want to improve upon this later.
Also, use a truly impossibly high number in User Controller tests. The number `100`, (or `7777` in `trunk`), could be valid in certain test run configurations. The `REST_TESTS_IMPOSSIBLY_HIGH_NUMBER` constant is impossibly high for this very reason.
Finally, Skip Autosaves controller test for multisite. There's a PHP 5.2 edge case where paths calculated differently, possibly caused by differing version of PHPUnit.
Props adamsilverstein, aduth, azaozz, danielbachhuber, rmccue, danielbachhuber.
Merges [43767], [43768], [43769] to trunk.
See #45132, #45131.
Fixes#45128, #43316.
git-svn-id: https://develop.svn.wordpress.org/trunk@44126 602fd350-edb4-49c9-b593-d223f7449a82
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