test(code_language): suppress large fixture output and consolidate tests

[ceberam]

Summary

Cleans up tests/test_code_language_detection.py without changing any
test logic or coverage:

• Suppress verbose fixture output — the four large-input cases in
  test_detection_stays_linear_on_large_input were previously parametrized
  with raw string values (~200 k characters each). Under pytest -v these
  are printed verbatim as test IDs, flooding CI logs. Each case now uses
  pytest.param(..., id="<short-name>") so the output stays terse
  ([repeated-from-keywords], [repeated-select-lines], etc.).

• Consolidate hint-interaction tests — test_hint_takes_precedence_over_content
  and test_unrecognized_hint_falls_back_to_content tested the same
  integration boundary (hint vs. content resolution in
  detect_code_language). They are merged into a single parametrized
  test_detect_with_hint, consistent with the style used throughout
  the module.

No test cases were added or removed; all 55 tests continue to pass.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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