bug: The custom variables passed to register_prompt_context are not substituted in general_instructions

[tvsathish]

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Python version (python --version)

Python 3.11

Operating system/version

MacOS 14.6.1 (Sonoma)

NeMo-Guardrails version (if you must use a specific version and not the latest

0.11.0

Describe the bug

The context variables set as part of

rails.register_prompt_context(<key>, <value>) are not passed to the general_instructions section for the generic prompt.

In line 902 of [nemo](https://github.com/NVIDIA/NeMo-Guardrails/blob/develop/nemoguardrails/actions/llm/generation.py), I think the set context is not sent to the prompt rendering part.

Kindly treat this as urgent and fix it.

Thanks,
Paddy

Steps To Reproduce

1. Specify a custom prompt in the general_instructions section of config.yml with a custom variable
2. Set custom prompt variable using rails.register_prompt_conext(<key>, <value>)
3. The rendered output prompt doesn not take into account the set

Expected Behavior

The prompt used as part of general_instructions section should honour the custom variables set using rails.register_prompt_conext(<key>, <value>)

Actual Behavior

The prompt used as part of general_instructions section is not receiving the custom variables set using rails.register_prompt_conext(<key>, <value>)