fix: system prompt for code completion prompts and generations
What does this merge request do and why?
In this MR, we:
- Add system prompts for code completion prompts and generations
Fixes: Bug: including the suffix code in Code Suggesti... (gitlab-org/gitlab#499485)
Merge request checklist
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Tests added for new functionality. If not, please raise an issue to follow up. -
Documentation added/updated, if needed.