FIO-9280 fixed value property validation

[HannaKurban]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9280

Description

Added value property validation for the Select Boxes component in the form builder. Now, when trying to save a component, the value property validation is triggered. If the value property is invalid, an error appears and the selectboxes component is not saved.

Breaking Changes / Backwards Compatibility

n/a

Dependencies

formio/core#185

How has this PR been tested?

locally, automated tests have been 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