[Gecko Bug 1969865] Add tests for Global Privacy Control signal #55796
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Differential Revision: https://phabricator.services.mozilla.com/D252126
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1969865
gecko-commit: b994157aff3c72c658f873e2b1565d14188b0c83
gecko-reviewers: jgraham, manuel