Add 'location.file' to new vulnerability details component

What does this MR do and why?

Adds the finding's file location to the new, GraphQL-only details component. The file is rendered within a separate section "Location", which is also added.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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Related to #371722 (closed)

ee/app/assets/javascripts/security_dashboard/components/shared/vulnerability_details_graphql/index.vue

@@ -54,7 +54,7 @@ export default {
       required: true,
     },
     /**
-     * Location metadata for the vulnerability. It's fields depend on the type of security scan that found the vulnerability.
+     * Location metadata for the vulnerability. Its fields depend on the type of security scan that found the vulnerability.
      *
      * @typedef {{ startLine?: string, endLine?: string, blobPath?: string, file?: string }} VulnerabilityLocationSast
      * @typedef {( VulnerabilityLocationSast | null )} VulnerabilityLocation