FIO-9813: Add validate when hidden property to the Nested Form if any of the children has it

[alexandraRamanenka]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9813

Description

If there are some components inside hidden nested form that have validateWhenHidden, add this property to the Nested Form component itself, so during the parent's form validation it won't be skipped.

Breaking Changes / Backwards Compatibility

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Dependencies

formio/core#229

How has this PR been tested?

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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

[travist]

It seems to me that we should not mutate the component by adding a property. I would rather add a non-enumerable property using Object.defineProperty.

Object.defineProperty(component, 'validateWhenHidden', {
  value: true,
  writable: true,
  enumerable: false
});

[brendanbond]

Discussed with @alexandraRamanenka - we're going to go with a top down approach for nested forms. In other words, the nested form component will add the "validateWhenHidden" property to its definition, and child components will respect that parent property