fix: Correct formatting of Db2 TIME columns for row validation

[nj1973]

Description of changes

Uses correct format for TIME columns during row validation. Priot to this change the format was coming out as "HH24.MI.SS". After this PR is is "HH24:MI:SS".

Issues to be closed

Closes #1657

Checklist

• I have followed the CONTRIBUTING Guide.
• I have commented my code, particularly in hard-to-understand areas
• I have updated any relevant documentation to reflect my changes, if applicable
• I have added unit and/or integration tests relevant to my change as needed
• I have already checked locally that all unit tests and linting are passing (use the tests/local_check.sh script)
• I have manually executed end-to-end testing (E2E) with the affected databases/engines