Improve automation Python export quality and robustness

[TopProjectsCreator]

Motivation

• The automation pipeline Python exporter produced repetitive, fragile, and hard-to-read code that made generated scripts brittle and difficult to maintain.
• The goal is to improve readability, error handling, and runtime safety of exported Python automation scripts so users receive higher-quality, production-ready templates.

Description

• Added shared helpers for generated scripts: PipelineStepError, _safe_json_loads, _build_headers, and _request_step to centralize JSON parsing, header construction, and HTTP request logic.
• Replaced duplicated inline request logic in both API-key and generic HTTP action blocks with calls to _request_step and centralized header/token handling via _build_headers for consistent behavior and timeouts.
• Deduplicated required environment variable collection and introduced validate_environment() so credential validation is performed at runtime entry (if __name__ == "__main__") instead of on module import.
• Improved parsing error messages for malformed JSON config fields and added a request timeout to avoid long-hanging HTTP calls.

Testing

• Ran npm run -s lint -- src/components/ide/AutomationTemplatePane.tsx which completed successfully (repository contains unrelated pre-existing lint warnings but no new lint errors introduced by this change).

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