test: added test for api/services/rag_pipeline folder

[akashseth-ifp]

Checklist

• This change requires a documentation update.
• I added unit tests for api/services/rag_pipeline and its sub-folders.
• I validated the new test files with lint and test runs.
• Type-check for the added test files is clean in this environment.

Unit Test Added Summary

Added test files

• api/tests/unit_tests/services/rag_pipeline/test_pipeline_generate_service.py

• api/tests/unit_tests/services/rag_pipeline/test_pipeline_service_api_entities.py

• api/tests/unit_tests/services/rag_pipeline/test_rag_pipeline_dsl_service.py

• api/tests/unit_tests/services/rag_pipeline/test_rag_pipeline_manage_service.py

• api/tests/unit_tests/services/rag_pipeline/test_rag_pipeline_service.py

• api/tests/unit_tests/services/rag_pipeline/test_rag_pipeline_transform_service.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_built_in_retrieval.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_customized_retrieval.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_database_retrieval.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_package_imports.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_pipeline_template_base.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_pipeline_template_factory.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_pipeline_template_type.py

• api/tests/unit_tests/services/rag_pipeline/pipeline_template/test_remote_retrieval.py

• Result: ✅ Passed (80/80 tests)

Validation Commands

• uv run --project api ruff check api/tests/unit_tests/services/rag_pipeline api/tests/unit_tests/services/test_rag_pipeline_task_proxy.py
• uv run --project api mypy --follow-imports=skip api/tests/unit_tests/services/rag_pipeline
• uv run --project api pytest -q api/tests/unit_tests/services/rag_pipeline api/tests/unit_tests/services/test_rag_pipeline_task_proxy.py

Coverage Report (Changed Source Files)

File	Lines (%)	Branch (%)
api/services/entities/knowledge_entities/rag_pipeline_entities.py	95.29	87.50
api/services/rag_pipeline/entity/pipeline_service_api_entities.py	100.00	100.00
api/services/rag_pipeline/pipeline_generate_service.py	94.59	90.91
api/services/rag_pipeline/pipeline_template/built_in/built_in_retrieval.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/customized/customized_retrieval.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/database/database_retrieval.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/pipeline_template_base.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/pipeline_template_factory.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/pipeline_template_type.py	100.00	100.00
api/services/rag_pipeline/pipeline_template/remote/remote_retrieval.py	100.00	100.00
api/services/rag_pipeline/rag_pipeline.py	92.82	86.21
api/services/rag_pipeline/rag_pipeline_dsl_service.py	93.60	88.04
api/services/rag_pipeline/rag_pipeline_manage_service.py	100.00	100.00
api/services/rag_pipeline/rag_pipeline_transform_service.py	88.62	87.27

Fixes Issue - #32582

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