Visual Field Editor "Auto-number" checkbox is read-only for unreliably scoped tables

[bronwyncombs]

Describe the bug
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In the Field Formatters app resource visual editor, the Auto-number checkbox can't be selected for Numeric parts of a MaterialSample format.

To Reproduce
Steps to reproduce the behavior:

1. Go to App Resources > Field Formatters
2. Add a Material Sample format
3. Pick any field to base it on, add a numeric format part
4. See "Auto-number" checkbox is read only

Expected behavior
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Auto-number checkbox should be clickable

Screenshots
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Please fill out the following information manually:

• OS: macOS
• Browser: chrome
• Specify 7 Version: v7.12.0.7
• Database Name: demofish

Reported By
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Robyn @ Royal Botanic Garden of Edinburgh (1248)

Additional context

• Found with materialSample, Deaccession, and Borrow table so far.

• Workaround: Add inc="true" to the format in the XML editor.

Context from a convo between Elizabeth and Jason:

Looks like it's disabled when the scoping of the table can't be inferred.
You would get a HierarchyException when Specify tried to auto-increment a field for a table that can't be reliably scoped. So for something like a Permit, Disposal, CollectionRelType, etc., Specify can't determine how those tables should be scoped so it doesn't know how to restrict or "filter" which records it should use for auto-incrementing.

possibly related: #6293