Test enabling all processors and indexing

Currently blows up horribly.

Test bot says the test succeeds with "249 passes", locally I get 267 – and one exception. Seems the patch once again doesn't actually get applied. The test bot really picked a great time to collapse …
Anyways, the attached patch should fix this, too. Great we actually spotted a bug here!

One other thing, though:

+++ b/src/Tests/IntegrationTest.php
@@ -88,6 +88,36 @@ class IntegrationTest extends WebTestBase {
+   * Test all the processors, all the time.

What do you mean with that?
Actually, I'd find it a good idea to keep the processors always enabled. But this will just enable it in a separate test case and then test nothing more, especially not indexing or searching. So I think that should be changed to be a method right at the beginning of the existing test, which enables all processors and just leaves them on for the complete test. Might change some results and thus need more changes to the test case, but we'd just have to review those to see whether they make sense or point to bugs.

This needed a re-roll. Also, I'd like to try whether enabling the processors before setting the fields works, too. That way, they have the most time to mess things up.

I think that should fix it.

Re-roll made necessary by #2473267: Verify field labels are escaped properly.

Apparently a caching problem, see also #2637032: Clear our index fields cache when entity fields are edited.

Great to hear, thanks for reviewing!