Make expected checks case-insensitive and normalize list/set elements

[AlexanderOnischenko]

Motivation

• Make the runner's expectation checks robust to casing differences for contains and equals comparisons and to minor formatting differences in list/set elements.
• Keep error messages showing the original (un-normalized) strings while performing comparisons using normalized values.

Description

• Added normalization helpers _normalize_text and _normalize_strings in examples/demo_qa/runner.py and updated _match_expected to use them for comparisons.
• For contains checks, compare norm(expected) in norm(actual) by using _normalize_text on both sides.
• For equals checks, perform norm(expected) == norm(actual) and added support for list/tuple/set comparisons by normalizing elements and comparing lists or sets as appropriate while still reporting original strings in ExpectedCheck.detail.
• Added unit tests in examples/demo_qa/tests/test_demo_qa_runner.py covering case-insensitive contains, case-insensitive equals, and normalized list comparisons (test_match_expected_contains_pass_and_fail, test_match_expected_equals_is_case_insensitive, test_match_expected_list_comparison_normalizes_elements).

Testing

• No automated test suite was executed as part of this change (no pytest run in the rollout).
• New unit tests were added but not run: test_match_expected_equals_is_case_insensitive and test_match_expected_list_comparison_normalizes_elements in examples/demo_qa/tests/test_demo_qa_runner.py.

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Codex Task