fix: multiselect relationship bug and improve accessibility

[JessChowdhury]

Description

Closes #117 - hitting the space key while the ReactSelect is in focus crashes the page.

This PR makes the following changes:

• Multivalue select component updated to only use id, drag feature does not work when using uuid()

• Ensures relationship field (multi and single value) can be accessed via the keyboard

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

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

Checklist:

• Existing test suite passes locally with my changes

[JarrodMFlesch]

Couple other small things:

• Lets make the chevron stroke 1px when inside a relationship select to match the other icons
• I am unable to focus on the EditIcon and open the modal for editing when the relationship is a hasMany

[JessChowdhury]

@JarrodMFlesch pushed the following changes:

• change the chevron stroke width to 1px
• show focus outline for EditIcon when the relationship is a hasMany
• update the dropdown indicator to a button element
• simplify the drowdown indicator onClick as suggested