Python: Fix VolatileMemoryStore ignoring with_embeddings=False in get_batch and get_nearest_matches

[PRABHU KIRAN VANDRANKI (VANDRANKI)]

Motivation and Context

VolatileMemoryStore.get_batch and get_nearest_matches documented with_embeddings=False as "do not include embeddings", but the code rebound a loop variable to a deepcopy and dropped it, so the original records (with embeddings) were returned. Fixes #14522.

Description

Build the list of deep copies first and clear the embedding on the copies, so the stored records keep their embeddings. Added tests/unit/memory/test_volatile_memory_store_embeddings.py (4 tests). Two of them fail on main and all pass with the change.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines (ruff and mypy are clean on the changed files)
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused fix correctly addresses the discarded-copy bug and includes appropriate regression coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes VolatileMemoryStore to honor with_embeddings=False without mutating stored records.

Changes:

• Deep-copies batch and nearest-match results before removing embeddings.
• Adds unit tests for both embedding modes and storage preservation.

File	Description
python/​semantic_kernel/​memory/​volatile_memory_store.py	Corrects embedding removal on returned copies.
python/​tests/​unit/​memory/​test_volatile_memory_store_embeddings.py	Tests embedding inclusion, exclusion, and persistence.

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