Always enable probabilistic sandbox state flag for testing, in order to avoid flakiness of the tests caused by the probabilistic enablement of sandbox features.
<rdar://problem/101349573>
Pull request: https://github.com/WebKit/WebKit/pull/5552
Committed 255826@main (cb31f36ddcbe): <https://commits.webkit.org/255826@main> Reviewed commits have been landed. Closing PR #5552 and removing active labels.