Default schemas shouldn't be visible to select formula values

[kirill-tolochko]

Problem description

The values for the variables in the usual schemas (not VC) aren't displayed in the related fields in the View Formula dialogs, because there is no any document created for default schemas. So we need to hide default schema options, only VC schemas should be available for selection.

Step to reproduce

Steps to reproduce the behavior:

1. Import this policy with the formula 1739367978.374805000
2. Open Edit Formula tab in the imported formula
3. Set Link (Input) field for variable, and Link (Output) field for Text. User is able to select field from the default schemas (i.e. Contact Details, Lead User Details or Applicant Details).

Expected behavior

User shouldn't be able to select the field from the default schemas (i.e. Contact Details, Lead User Details or Applicant Details).

Actual behavior

User is able to select the field from the default schemas (i.e. Contact Details, Lead User Details or Applicant Details).