Required attachment field fixes

[aatkin]

Describe the bug or behavior
When attachment field is required in form, it should:

• show warning on save draft when value is missing, and
• link to the field id (both warning and submit error)

Currently warning is not shown and the link to field is broken.

Screenshots

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Environment

• Version of REMS: 2.26
• OS: MacOS 12.4
• Browser: Chrome 102.0.5005.61