As a user I want to file a Director Change with custom dates but I want to be blocked if it conflicts a filing so I don't cause a correction

## Description:
Given I am logged in and want to file a standalone Director Change or Director Change as part of my Annual Report
When I choose a date for a standalone Director Change or as part of my Annual Report and the date conflicts with any other filing
Then I want a message telling me I am not allowed to do this and contact our office for help

**Dependencies**

**Acceptance Criteria**

**Validation Rules**

Ready to Build (DoR):
- [ ] Stakeholders have approved
- [ ] User story completed
- [ ] What are the dependencies
- [ ] Validation rules defined (UI, Data, Role-Action)
- [ ] Is a formal UAT required

Acceptance / DoD:
- [ ] Design / Solution accepted by Product Owner
- [ ] Acceptance criteria has been defined (happy path, known sad paths)
- [ ] Test coverage acceptable
- [ ] Peer Reviewed
- [ ] Accessibility reviewed and acceptable [checklist](https://github.com/bcgov/entity/docs/coding-standards/accessibility.md)
- [ ] UX Approved
- [ ] PR Accepted
- [ ] Production burn in completed