GetClosestSetting should detect circular reference

Description

This test procedure requires writing code.

1. Create a content asset folder (CF).
2. Create block (B).
3. Set B parent till CF.
4. Set ContentOwnerID till B.

Expected: Logs and throw exception or break from infinite loops.
Actual: Stack overflow exception.

Breaking changes

• ContentLanguageSettingsHandler no longer contains implementation code, use interfaces IContentLanguageSettingsHandler or IContentLanguageSettingsResolver instead.

• ContentLanguageSettingsHandler.Instance now returns the interface.

• GetClosestSetting has been removed; use IContentLanguageSettingsHandler.Get.