Fix spec violations in projects_dropdown_filter_spec

What does this MR do and why?

In regards of epic &5102, this MR fixes the following spec violations in spec/frontend/analytics/shared/components/projects_dropdown_filter_spec.js #390962 (closed):

• setData usage

How to set up and validate locally

Run tests:

yarn jest spec/frontend/analytics/shared/components/projects_dropdown_filter_spec.js

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.