FIO-9908: fixed an issue where conditional setting with "show" set as a string does not work well

[TanyaGashtold]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9908

Description

What changed?

If the conditional 'show' is a string (like 'true' or 'false'), we need to parse it and convert to boolean so that it works as expected.

Dependencies

https://github.com/formio/premium/pull/386
formio/formio.js#6069

How has this PR been tested?

Manually + autotests

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