fix: using uuid_generate_v4 function

[giuliocalzolari]

removing the md5 function for the uuid generation with native pgsql function https://www.postgresql.org/docs/current/uuid-ossp.html

Related issue(s)

#3844

Checklist

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• I have referenced an issue containing the design document if my change
  introduces a new feature.
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• I have added tests that prove my fix is effective or that my feature
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Further Comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Hello, could you please sign the CLA? Also please notice that tests are failing, probably due to the changes in this PR

[giuliocalzolari]

hi @aeneasr I've update the PR, all test are now passing (a part Docker Image Scanners but I believe is not related to my change)