Set QA_IMAGE to nil in Gitlab::QA::Component::Specs tests

Rémy Coutablerequested to merge
fix-specs-spec-when-qa-image-is-given into master

In CI, QA_IMAGE could be set and modify the tests' behavior. Ensure we reset it to nil.

This will avoid spec failures when downstream pipelines are triggered from gitlab!56110 (comment 532389170).

Edited by Rémy Coutable

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