fix: clear button on create form should reset select field

[scottyoung]

Problem

The Clear button on a Create Form does not reset a SelectField correctly.

Solution

Setting the value of a SelectField to an empty string "" rather than undefined will correctly set the value of the field to the first option of the dropdown, either the Placeholder, or the first option if no placeholder exists.

Additional Notes

Links

Ticket

GitHub issue _____

Other links

Verification

Manual tests

1. Load a Create form with a SelectField. Choose an option for the SelectField, and then press the Clear button. SelectField returns to placeholder text.
2. Load an Update form with a SelectField. Choose a new option for the SelectField, and then press the Reset button. SelectField returns to original option.

Automated tests

• Unit tests added/updated
• E2E tests added/updated
• N/A - (provide a reason)
• deferred - (provide GitHub issue for tracking)

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