Backport of [ui] Prevent double-open for cmd+click on vars index links into release/1.9.x #24330
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Backport
This PR is auto-generated from #24316 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
I pretty much duplicated the fix performed in #23832 but modified it for Vars instead of Jobs.
Not a JS guy so I could be way off-base here.
[Hopefully] Resolves #24315
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