[Site Isolation][macOS] TestWebKitAPI.ProcessSwap.TerminatedSuspendedPageProcess (api-test) is a constant Fail.

https://bugs.webkit.org/show_bug.cgi?id=324281
rdar://187501775

Reviewed by Alex Christensen and Sihui Liu.

Expect the process ID to change when site isolation is enabled even if relatedView is set.

* TestExpectations/apitests:
* Tools/TestWebKitAPI/Tests/WebKit/WKWebView/ProcessSwapOnNavigation.mm:
((ProcessSwap, TerminatedSuspendedPageProcess)):

Canonical link: https://commits.webkit.org/322787@main