[stable32] feat: Add memcache_customprefix #33314

Job	Run time
changes	7s
php8.3-webdav	47s
php8.4-webdav	45s
php8.1-webdav	47s
php8.2-webdav	1m 9s
files-external-webdav-summary	5s
	3m 40s

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