Remove custom CI $wgTempAccountCreationThrottle

This effectively reverts change Ibc2f2bb5be (commit ae7eda4); in the
meantime, MediaWiki core change Ie5a94d8b67 (commit 7db4723f3a)
completely disabled this throttle in CI, which is better (the limit of
100 configured here was still hit in the CI job for Id676be0f3a).

Bug: T365676
Change-Id: I109da6b4bb4b83653b00cb5a77e840cc9f7fd217

repo/config/Wikibase.ci.php

@@ -70,9 +70,5 @@
 	$wgAutoCreateTempUser,
 	json_decode( getallheaders()[ 'X-Wikibase-Ci-Tempuser-Config' ] ?? '{}', true )
 );
-$wgTempAccountCreationThrottle = [ [
-	'count' => 100,
-	'seconds' => 86400,
-] ];
 
 $wgWBRepoSettings['tmpEnableMulLanguageCode'] = boolval( getallheaders()[ 'X-Wikibase-Ci-Enable-Mul' ] ?? false );