Adjust security training to use temp resolvers

What does this MR do and why?

There's been a change on the backend regarding the fetching of security_training_urls. This means our current query security_training_vulnerability.query.graphql will be invalid after the introduction of this MR > !82555 (comment 872209189). To ensure that MR will pass our current pipeline, I am making some adjustments in this MR:

• Updating the current query to use a temporary resolver.
• Deleting the specs (don't worry, we will introduce them back in a follow-up MR)

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