fix(standard-tests): standard vectorstore tests accept out-of-order get_by_ids

[hemidactylus]

• Description: The vectorstore standard-test mistakenly assumes that the store's get_by_ids respects the order of the provided ids. This is not the case (as the base class docstring states). This PR fixes those tests that would fail otherwise (see issue standard-tests: some vector store tests mistakenly assume get_by_ids preserves document order #32820 for details, repro and all). Fixes standard-tests: some vector store tests mistakenly assume get_by_ids preserves document order #32820
• Issue: Fixes standard-tests: some vector store tests mistakenly assume get_by_ids preserves document order #32820
• Dependencies: none

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Sep 4, 2025 10:39pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32821 will not alter performance

_{Comparing hemidactylus:SL-vstore-stdtests-unordered-get_by_ids (d036c99) with master (bc91a48)}

⚠️ Unknown Walltime execution environment detected

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Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32821 will not alter performance

_{Comparing hemidactylus:SL-vstore-stdtests-unordered-get_by_ids (d036c99) with master (bc91a48)}

Summary

✅ 14 untouched benchmarks