Entity recursive rendering protection is not compatible with Fibers

Coming here from #3583187-8: [random test failure] DuplicateContextualLinksTest::testSameContextualLinks:

However, while trying to do that, I discovered why this test suddenly started to fail so often, and it's because of #2940605: Can only intentionally re-render an entity with references 20 times. Since that issue, the node in our test is no longer being rendered in both views blocks, it now appears only the first block rendered on the page, which (funnily enough) is the _second_ views block, that's why my initial MR asserted that one :)

Not sure if these are the same issue, but can be investigated, and if not, we can open a separate issue.

I checked this change on the test that was failing randomly and it does fix it! Working on a test that doesn't require a view to trigger the problem.

Pushed the test! It was quite tricky to determine all the conditions required to hit this problem: we need a block that's placeholdered so it renders in a Fiber, and the entity being rendered needs a formatted text field to create filter placeholders that cause the Fiber to suspend mid-render, allowing the other block's Fiber to start and hit the collision.

Test-only pipeline fails as expected: https://git.drupalcode.org/project/drupal/-/jobs/9273587