fix: output parser bugs in xml.py and pydantic.py

[jnMetaCode]

Summary

• Fix missing spaces in error messages in xml.py: Adjacent string literals in two ImportError messages were missing spaces between them, resulting in concatenated words like "parser.You" and "defusedxml`See".
• Fix partial parameter not forwarded in PydanticOutputParser.parse_result: The partial parameter was accepted but not passed to super().parse_result(), so partial parsing mode had no effect.

Files Changed

• libs/core/langchain_core/output_parsers/xml.py — Added trailing spaces to adjacent string literals in two error messages
• libs/core/langchain_core/output_parsers/pydantic.py — Forward partial=partial to super().parse_result()

Test plan

• Verified the string concatenation produces correct spacing
• Verified parse_result now respects partial=True by forwarding to parent class

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 13 untouched benchmarks
⏩ 23 skipped benchmarks¹

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_{Comparing jnMetaCode:fix/output-parser-bugs (08f6e02) with master (29134dc)²}

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on master (532b014) during the generation of this report, so 29134dc was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩