Fix Python ecosystem PyPI-to-import name mismatch and code review follow-ups

[tmihalac]

Python name normalization:

• Add _resolve_tree_key in CCA to fall back to is_same_package for tree lookups
• Re-key dep tree from PyPI names to import names via _find_module_dirs/top_level.txt
• Add PEP 503 is_same_package override in PythonLanguageFunctionsParser
• Wire dependency builder into parser via lang_functions_parsers_factory
• Use parser is_same_package in FL _is_package_available instead of inline lambda
• Use PEP 503 re.sub(r'[-.]', '-') for root dep matching instead of replace('-', '')
• Replace pip install with uv pip install for deptree setup

CCA query parsing:

• Fix dotted function name splitting with rpartition instead of split
• Fix __determine_doc_package_name to use _resolve_tree_key with fallback

JavaScript parser:

• Guard is_function check before get_function_name in search_for_called_function

[tmihalac]

/test vulnerability-analysis-on-pr