Use canonical --tests flag in YAML main test

[Eliaaazzz]

Addresses #37980

Updates test_inline_test_specs in main_test.py to use the canonical --tests (plural) flag instead of the --test (singular) alias, aligning the test with the primary argparse flag name and all documentation references.

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Summary of Changes

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This pull request aligns the YAML pipeline test suite with the project's documentation and primary argument parsing configuration. By switching to the canonical flag, the codebase maintains consistency and ensures that tests reflect the intended usage patterns defined in the project's documentation.

Highlights

• Flag Standardization: Updated the test suite to use the canonical '--tests' flag instead of the deprecated '--test' alias.

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