Changes to the use statements done automatically via script
Addition of missing use statements done manually
Change-Id: Id44f211320e56bc83e4c8f243369dc4eb562cf37
Details in Ia4df6350f849ca27.
The global variable will still work in most cases, but the way it was
used here (as wgExtensionFunctions callback) will stop working to
allow MW core to run plain `phpunit` (T90875).
Migrate to the MW_QUIBBLE_CI constant instead, which is set in all
the same circumstances
Change-Id: I25acee1e6e88ca745435cbfa0b398041f04c94d6
