fix: do not validate name if overwrite set to true

[faymarie]

Related Issues

• when overwriting existing pipelines, the validation would always warn about pipeline/index already existing
• Fixed by excluding the name from the validation call in case of overwrite
• Fixes import of PipelineOutputType

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• I have updated the referenced issue with new insights and changes
• If this is a code change, I have added unit tests
• I've used the conventional commit specification for my PR title
• I updated the docstrings
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Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
deepset_cloud_sdk/workflows/pipeline_client
pipeline_service.py
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[faymarie]

forgot to add this in d370b98