(test) O3-3926 Improve inline-date-adapter test coverage.

[suubi-joshua]

Requirements

• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

Ensure inline-date-adapter.ts is robust against edge cases in OpenMRS form engine.
Test Scenarios Implemented

1. Overwrite target field's obs date prop value
   Tests submission updates with Date objects and strings.

2. Edit previously associated date in edit mode
   Optimization test: Only updates obsDatetime when value actually changes

3. Commit side-effects when target field has value or submission
   Tests submission creation with current or initial values
   New validation: Prevents submission when target field has NO value
   Ensures no orphaned dates without observation data

4. Extract initial value from target field's obs
   Tests retrieval from target field's observation object
   Handles missing data and edge cases

Screenshots

Related Issue

https://openmrs.atlassian.net/browse/O3-3926

Other