Add reachability field to the Vulnerabilties ES index

Bala Kumarrequested to merge
543490-add-reachability-field-to-vuln-es-index into master

What does this MR do and why?

Adds the reachability field to Vulnerabilities ES index.

The reference mapping, field sync, backfill migration will be in follow up MRs.

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How to set up and validate locally

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Related to #543490 (closed)

Edited by Bala Kumar

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