FIO-9189: fixed an issue where data is lost after submission for the conditionally visible field when the condition is based on select resource

[TanyaGashtold]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9189

Description

What changed?

• added a special check for the select resource with object type in isEqualTo operator
• changed isNotEqualTo operator to use comparison logic from isEqualTo operator
• moved some method from formiojs to core

Dependencies

Use this section to list any dependent changes/PRs in other Form.io modules

How has this PR been tested?

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