FIO-9184: Fixed edit grid row validation for new row

[roma-formio]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9184

Description

Issue: The shouldValidateRow method currently checks for EditRowState.New, which causes the validation of a new row on any change.

Solution: Replace EditRowState.New with EditRowState.Saving to ensure that the new row is validated only after an attempt to save it.

How has this PR been tested?

Unit tests, manually

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

[brendanbond]

@roma-formio mannnnnnn I tried to fix the merge conflicts in the test file and may have clobbered things, but it looks like tests are failing