OutputPage: Hard-deprecate setSquidMaxage, renamed since 1.27

OutputPage: Hard-deprecate setSquidMaxage, renamed since 1.27

Renamed and deprecated in MediaWiki in f606fd8d since 1.27.

Only six uses in Wikimedia-hosted git repositories, marked as
dependencies. Also one use snuck back into MediaWiki itself,
fixed in this patch.

Depends-On: Ie8c13a6b1dc1b7861f6c27bbba996099375f066b
Depends-On: Ic2ea90343efda6533c06ca1325bc85d9aa776078
Depends-On: Ibba2f486f0ecb684ded7efb09f9942f5e0f5fd7a
Depends-On: Id27a48e10fd127e00f68e1020e8f40e30ba9a251
Depends-On: Ifd6db7910a71bb700484d6b588327424f11c00e0
Depends-On: I6523059941eb5f86274e364a8d5cc74b849655a4
Change-Id: I2cdfcd60fc7934830e3e6ec132958aa2aa1fe486