Backport hybrid search filter and CI fixes to release/1.4.0 - #253

…e#252)

## Summary

- constrain the `DBMS_HYBRID_SEARCH.GET_SQL` rewrite to backtick-quoted
`JSON_EXTRACT(...)` expressions
- preserve ordinary quoted identifiers in filtered BM25, KNN, and
combined hybrid-search SQL
- keep the pytest-summary fallback required by `pylibseekdb`, but fail
on positive `failed`/`error(s)` counts and on missing successful
summaries
- add regression tests for both the SQL rewrite and CI summary parsing

Fixes oceanbase#251.

## Root cause

The previous regex could start at the closing backtick of one ordinary
identifier and end at the opening backtick of another whenever an
unquoted `JSON_EXTRACT` appeared between them. That produced malformed
SQL for metadata-filtered hybrid searches.

The integration tests already caught this regression, but the CI
fallback required a literal `=======` in pytest's final line. When the
summary format did not contain that exact marker, the `|| exit 0` branch
marked the job successful even with failures.

## Validation

- `pytest tests/unit_tests/test_hybrid_search_sql_rewrite.py
tests/unit_tests/test_ci_pytest_summary.py -q` — 11 passed
- `pytest tests/integration_tests/test_collection_hybrid_search.py -k
embedded -q` — 7 passed
- all four hybrid-search cases that failed in PR oceanbase#240's embedded job now
pass
- `prek run -a` — all checks passed

Local full-unit-suite note: 463 tests passed and 318 skipped; 6 existing
sentence-transformer tests failed because the local `transformers`
installation imports an unavailable `huggingface_hub.is_offline_mode`.
This is unrelated to the changed files.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved hybrid search SQL handling so quoted identifiers remain
intact while supported JSON extraction expressions are processed
correctly.
* Added validation to ensure test runs report a valid, passing pytest
summary.

* **Tests**
* Added coverage for successful, failed, interrupted, missing, and empty
test summaries.
* Added regression tests for hybrid search SQL rewriting, including
quoted identifiers and JSON extraction expressions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->