Python: Fix OracleCollection search with multiple filters

[PRABHU KIRAN VANDRANKI (VANDRANKI)]

Motivation and Context

OracleCollection._inner_search_vector only handled a single filter. With a list of filters, _build_filter returns a list of (sql, binds) tuples and the code raised AttributeError: 'tuple' object has no attribute 'values'. Each filter was also parsed with its own BindCounter, so bind names would have collided (:bind_val1 in every filter).

Fixes #14539

Description

Override _build_filter in OracleCollection so all filters share one BindCounter and are combined with AND into one (sql, binds) tuple, as VectorSearchOptions documents. A single filter returns the same tuple as before.

Added two tests in test_oracle.py: multiple filters (fails on main with the AttributeError) and a single filter regression check.

Checked locally: tests/unit/connectors/memory/test_oracle.py passes, ruff check and format are clean, mypy is clean on oracle.py. No database was needed, the tests build the query only.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• 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 implementation resolves both filter composition and bind-name collisions with appropriate regression coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes Oracle vector searches using multiple filters by combining them with AND and generating unique bind names.

Changes:

• Adds Oracle-specific multi-filter construction with a shared bind counter.
• Adds single- and multi-filter regression tests.

File	Description
python/​semantic_kernel/​connectors/​oracle.py	Combines filters and binds safely.
python/​tests/​unit/​connectors/​memory/​test_oracle.py	Covers single and multiple filters.

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