feat: Add support for passing env vars to run command (#10986)

* Add support for passing env vars to run command

The run CLI command now accepts --env-var KEY=VALUE options to inject global variables into the graph context. Includes validation for variable format and unit tests to verify correct injection and error handling. Also improves script loading to register modules by script name for better inspection.

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* Support CLI env var precedence over OS env vars

Updated environment variable loading logic to prioritize CLI-provided variables (request_variables in context) over OS environment variables for load_from_db fields. Added unit tests to verify correct precedence and fallback behavior.

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* fix ruff

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* Refactor run CLI to delegate execution to run module

Refactors the run CLI command to delegate execution logic to a new lfx.run.base module, improving separation of concerns and maintainability. Moves core run logic and error handling into lfx.run.base, introduces a RunError exception, and updates tests to target the new structure. Removes the --env-var option from the CLI and migrates related tests to the run module.

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* Update src/lfx/src/lfx/interface/initialize/loading.py

Co-authored-by: Gabriel Luiz Freitas Almeida <[email protected]>

* Update src/lfx/src/lfx/interface/initialize/loading.py

Co-authored-by: Gabriel Luiz Freitas Almeida <[email protected]>

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* Update loading.py

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* Reorder import of PydanticDeprecatedSince20

Moved the import of PydanticDeprecatedSince20 to group it with other pydantic imports, improving code organization.

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* fix ruff

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* Update test_base.py

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* Fix structlog setup and logger patching in tests

Add a pytest fixture to configure structlog before tests to prevent AttributeError when mocking logger.configure. Update unit tests to patch the actual logger module using sys.modules, ensuring correct patching and avoiding issues with module references.

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <[email protected]>