FIO-9197: Fix Day component triggered required validation when loading form

[mikekotikov]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9197

Description

What changed?

Made a check to count before 9.3.x '00/00/0000' value as empty. Added convertion to an empty string if this value is met.

Why have you chosen this solution?

Use this section to justify your choices

Breaking Changes / Backwards Compatibility

Checked against such scenarios, haven't noticed any issues

1. application that uses 4.x renderer works with 9.3.x server validations.

2. application that uses 5.x renderer works with 8.x server validations.

3. application that uses 5.x renderer works with 9.2.x server validations.

4. application that uses 5.x renderer works with 9.3.x server validations.

Dependencies

None

How has this PR been tested?

Automated test added

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above