test: add unit tests for the schema_converter boolean-schema filter

[eeshsaxena]

Description

composio.utils.schema_converter._filter_boolean_schemas pre-processes JSON
Schemas before handing them to json-schema-to-pydantic, which doesn't
support boolean schemas (draft-06+ allows true/false as schemas). It
replaces true with {}, drops false, and recurses through combiner
arrays (anyOf/allOf/oneOf), properties, items and $defs. It had no
test coverage.

This adds python/tests/test_schema_converter.py covering:

• True -> {} and False -> None
• non-schema values passing through unchanged
• lists dropping False entries, and an all-False list becoming None
• combiner arrays dropping False entries, and the whole combiner being
  removed when every entry is False
• a False property being dropped while siblings are kept
• plain keys being preserved

No source changes.

Verification

pytest python/tests/test_schema_converter.py - 9 passed. ruff check /
ruff format clean.

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