Merged PR 3752: Adds new PROTECTED accepted value for new pricing services

# Description

Adds Protected accepted value - linked to new services after New Dash v3 launch

# Checklist

- [NA] The edited models and dependants run properly with production data.
- [NA] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [NA] I have checked for DRY opportunities with other models and docs.
- [NA] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Adds new PROTECTED accepted value for new pricing services

models/staging/core/schema.yml

@@ -1062,6 +1062,7 @@ models:
           - not_null
           - accepted_values:
               values:
+                - "PROTECTED"
                 - "NOFLAGS"
                 - "REJECTED"
                 - "FLAGGED"