Rename allow_deprecated_functions to allow_deprecated_error_prone_window_functions

Why it matters

This change clarifies the configuration option by specifying that it controls the usage of deprecated and potentially error-prone window functions, improving user understanding and reducing confusion when managing feature flags related to window functions.

How to use it

Replace all instances of the old setting allow_deprecated_functions with allow_deprecated_error_prone_window_functions in your ClickHouse server configuration or client queries to enable or disable deprecated error-prone window functions.