ZEVA 2 - ICBC Time Stamp" Change in VIN Validation

**Describe the task**
Currently, the "ICBC Time Stamp" column in the validation tab of the CA workflow for IDIR users attempts to reference multiple columns in the CTHub ICBC data. It starts with "Registration Date" and if this is emtpy it moves to the next date column (Which other Columsn does it currently reference?).

**Purpose**
The Business Area only wants the system to reference "Registration Date" as that is the only date they are interested in.

**Acceptance Criteria**
- [x] The "ICBC Time Stamp" column in the Validation tab of the CA workflow for IDIR users should only attempt to display the "Registration Date" from the CTHUB ICBC data.
- [x] If the "Registration Date" entry is blank in CTHUB, then the corresponding "ICBC Time Stamp" entry in ZEVA should also be left blank
- [x] The process should not query other date columns in CTHUB for the "ICBC Time Stamp" value.

**Additional context**