chore: improve date selection

[FabienV69]

Description

Selecting a start date that was in the future relative to the end date had no effect. With this code, selecting a start date that is later than the end date automatically updates the end date to match the start date.
This also prevents the user from selecting an end date that is earlier than the start date

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Only in local in the web browser by creating an event

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules