Code clean-up: prompt template string elements repeated across code locations

[dxtrous]

Is your feature request related to a problem? Please describe. The following lines of code: https://github.com/pathwaycom/pathway/blob/main/python/pathway/xpacks/llm/prompts.py#L121 https://github.com/pathwaycom/pathway/blob/main/python/pathway/xpacks/llm/question_answering.py#L15 https://github.com/pathwaycom/pathway/blob/main/python/pathway/xpacks/llm/prompts.py#L35 define string constants representing no-answer-found in separate ways. I am wondering if there is a purpose in having a default argument value which is overridden by its primary wrapper.

Describe the solution you'd like This could merit clean-up.

Describe alternatives you've considered Leave as is.

Additional context N/A