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A/B test for experimental suggestions api

Description

A/B test for experimental suggestions api

Creates test with 1 in 10000 sampling rate per bucket measuring
the zero result rate of the current opensearch completion api
and an experimental cirrus-suggest completion api.

Test must be enabled by setting:

$wgWMEEnableCompletionExperiment = true

Required mediawiki-core patch: I1fab57ea

Bug: T111137
Change-Id: I595db33a1970651f34290bdfe1f924ad11119bc3