Build: Restore removed files from Gutenberg build change. #1635

Job	Run time
Test twentytwentyone build script	25s
Test twentytwentytwo build script	14s
Test twentynineteen build script	14s
Test twentytwenty build script	1m 10s
Test twentytwentyfive build script	14s
twentythirteen empty file check	5s
twentytwentyfour empty file check	11s
twentyseventeen empty file check	9s
twentytwelve empty file check	6s
twentyfifteen empty file check	6s
twentyfourteen empty file check	6s
twentysixteen empty file check	7s
twentyten empty file check	6s
twentynineteen empty file check	7s
twentytwenty empty file check	5s
twentytwentyone empty file check	8s
twentytwentyfive empty file check	7s
twentytwentytwo empty file check	7s
twentyeleven empty file check	8s
twentytwentythree empty file check	6s
Create ${{ matrix.theme }} ZIP file	0s
Slack Notifications	-1s
Failed workflow tasks	-1s
	3m 59s

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