Stabilize --experimentalBorder php file changes #11373

Job	Run time
Core running from build / Core running from build / Linux	2m 4s
Core running from src / Core running from src / Linux	2m 0s
Core running from build / Core running from build / Windows	3m 47s
Core running from src / Core running from src / Windows	3m 34s
Core running from build / Core running from build / MacOS	2m 41s
Core running from src / Core running from src / MacOS	1m 50s
Gutenberg running from build / Gutenberg running from build / Linux	8m 55s
Gutenberg running from build / Gutenberg running from build / Windows	11m 53s
Gutenberg running from src / Gutenberg running from src / Linux	8m 59s
Gutenberg running from src / Gutenberg running from src / Windows	12m 38s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 42s
Gutenberg running from src / Gutenberg running from src / MacOS	9m 29s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 16m 32s

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