Don't rely on the pagereveal event in lcp/image-upscaling.html #6038

Job	Run time
./wpt test-jobs	16s
affected tests without changes: Safari Technology Preview / 1 (of 1)	53m 26s
affected tests: Safari Technology Preview / 1 (of 1)	53m 24s
infrastructure/ tests: macOS	-1s
affected tests: Safari Technology Preview / Notify (unmerged results)	0s
affected tests: Safari Technology Preview / Merge results artifacts	0s
affected tests: Safari Technology Preview / Notify (merged results)	0s
affected tests without changes: Safari Technology Preview / Merge results artifacts	0s
affected tests without changes: Safari Technology Preview / Notify (unmerged results)	0s
affected tests without changes: Safari Technology Preview / Notify (merged results)	0s
affected tests: Safari Technology Preview / 1 (of 1)	1m 7s
affected tests without changes: Safari Technology Preview / 1 (of 1)	1m 25s
infrastructure/ tests: macOS	0s
./wpt test-jobs	16s
affected tests without changes: Safari Technology Preview / Merge results artifacts	3s
affected tests without changes: Safari Technology Preview / Notify (unmerged results)	0s
affected tests without changes: Safari Technology Preview / Notify (merged results) / Notify wpt.fyi	4s
affected tests: Safari Technology Preview / Merge results artifacts	4s
affected tests: Safari Technology Preview / Notify (unmerged results)	-1s
affected tests: Safari Technology Preview / Notify (merged results) / Notify wpt.fyi	5s
	1h 50m 8s

Provide feedback