🗑️ Deprecation promotion of toStrictlyPositiveInt extension function to error level

[LVMVRQUXL]

📝 Description

We would like to promote the deprecation of the Number.toStrictlyPositiveInt() extension function to an error level.

🔗 Dependencies

This issue is blocked by the following ones:

• 🗑️ Deprecation of toStrictlyPositiveInt extension function with warning level #442

✅ Checklist

• Promote the deprecation of this declaration, remove its tests and update the unreleased changelog.
• Close this issue as completed and update tracking ones if present.

[LVMVRQUXL]

We are not ready to implement this change.