Add a retry to account for GraphQL loading time

What does this MR do and why?

Describe in detail what your merge request does and why.

Adds retries to qa/specs/features/ee/browser_ui/10_govern/vulnerability_management_spec.rb to attempt to account for GraphQL loading.

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How to set up and validate locally

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qa % CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All http://gdk.test:3000/ ./qa/specs/features/ee/browser_ui/10_govern/vulnerability_management_spec.rb

MR acceptance checklist

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