[RaisinBread] Fixed Candidate DoB and Date_registered entries

[satvik-tha-god]

Brief summary of changes

Changes entries with negative DATEDIFF > 9 months between DoB and Date_registered from candidate table in RaisinBread data

Link(s) to related issue(s)

• Resolves #8143

[driusan]

@satvik-tha-god The build should be fixed now. Can you rebase this to make sure tests still pass?

[christinerogers]

Thanks for these important fixes to our sample dataset @satvik-tha-god 👍