Validation for default data typed into a field mapping profile is not working

Overview: When default data (non-MARC field) is added to a field mapping profile, it must be enclosed in quotation marks. If the value is selected from a dropdown, the quotation marks are added automatically. If the value is typed by the user, no quotation marks are added, and no validation error appears.

Current workaround: None - import fails because of invalid data, and user has to inspect the field mapping profile to find the invalid mapping

Steps to Reproduce:

1. Log into FOLIO-snapshot-load as diku_admin
2. Go to Settings/Data Import/Field mapping profiles
3. Create a new field mapping profile
   • Incoming record type: MARC bib
   • Existing FOLIO record type: Item
   • In the field mapping details, type a default value into the Item identifier field, e.g. TEST
   • Save the field mapping profile

Expected Results: If text is entered into a field mapping profile with incoming record type = MARC Bib, and the text does not have quotation marks around it, then show a validation error under the field(s) missing the quotation marks.
Error text: Non-MARC value must use quotation marks
Exceptions

• MARC field and subfield, e.g. 900$a
• MARC strings beginning with LDR, 005, 006, 007, 008 (e.g. LDR/8-10, or 008/34)
• ; else (the syntax for cascade)
• ###TODAY### (only for date fields)
• ###REMOVE### (only for non-repeatable fields)

Actual Results: Field mapping profile can be saved with default data with no quotation marks around it.

Additional Information: Validation logic described in UIDATIMP-405, but this exact use case not specified. Can we add it? I have found 4 user errors in Bugfest testing due to missing quotation marks.