Add some logging if cache fails to write #1454

Job	Run time
call-mediawiki-tests-workflow (master, 7.4, 74, true, false) / master \| PHP 7.4	3m 12s
call-mediawiki-tests-workflow (master, 8.2, 82, true, false) / master \| PHP 8.2	3m 29s
call-mediawiki-tests-workflow (REL1_39, 7.4, 74, true, false) / REL1_39 \| PHP 7.4	3m 11s
call-mediawiki-tests-workflow (REL1_40, 8.2, 82, true, true) / REL1_40 \| PHP 8.2	3m 12s
call-mediawiki-tests-workflow (REL1_40, 7.4, 74, true, false) / REL1_40 \| PHP 7.4	2m 54s
call-mediawiki-tests-workflow (REL1_41, 7.4, 74, true, true) / REL1_41 \| PHP 7.4	3m 28s
call-mediawiki-tests-workflow (REL1_41, 8.2, 82, true, true) / REL1_41 \| PHP 8.2	3m 12s
notify-irc	23s
	23m 1s

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