FIO-9321 fixed onlyAlailableItems validation for select Boxes

[HannaKurban]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9321

Description

The problem of incorrect Only Available Items validation of the Select Boxes component value has been fixed.
The value of the Select boxes component is a map with pairs key (value option) - value (true or false). Therefore the check for the difference between the data value keys and allowed options values has been added.

Breaking Changes / Backwards Compatibility

n/a

Dependencies

n/a

How has this PR been tested?

Automated tests have been added. All tests pass locally

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]

This looks good, but shouldn't we add the same condition to the synchronous version of this function (for, I guess, static values only)?