Fix a broken test in alert_component_spec.rb

What does this MR do and why?

This fixes a test broken by !96077 (merged).

Unfortunately, we have a test gap where unit tests aren't run when changes only happen in app/components. I'll open a separate MR to fix this.

How to set up and validate locally

bin/rspec ee/spec/components/namespaces/free_user_cap/alert_component_spec.rb:24

MR acceptance checklist

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

Related to #371974 (closed).