Sychronously create index index_vuln_findings_on_uuid_including_vuln_id

What does this MR do and why?

Uses a copy/paste migration code from this commit for the synchronous creation of the index index_vuln_findings_on_uuid_including_vuln_id

This index was originally added in an async migration in the following two MRs:

1. Index vulnerability findings on uuid including vuln id
2. Recreate async index index_vuln_findings_on_uuid_including_vuln_id

This commit is a followup to add the index synchronously as the final step in the Asynchronous Index Creation process

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Changelog: performance

How to set up and validate locally

1. refer to the Test database index changes locally docs

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #397740 (closed)