[kristynsmith]

Fixes several edge cases in code_object_pickler when generating and resolving stable code object identifiers:

• Addressed the case where multiple nested def functions have the same name (e.g. defined across if/else branches) by applying the same signature and bytecode-hash disambiguation in _search_locals (formerly _search_lambda) to any duplicate code object name in co_consts, and updating _OBJECT_WITH_ARGS_PATTERN and _OBJECT_WITH_HASH_PATTERN to match named functions in addition to <lambda>.
• Addressed the case where one of multiple lambdas/nested functions takes no arguments by updating _OBJECT_WITH_ARGS_PATTERN to match empty argument tuples ().
• Addressed the case where two lambdas or nested functions have identical co_code bytecode instructions (e.g. referencing different closure variables or constants) by including co_consts, co_names, co_varnames, co_freevars, and co_cellvars in _create_bytecode_hash.
• Addressed the case where a parent package re-exports a symbol with the same name as a submodule (e.g. from pkg.submod import submod in pkg/__init__.py) by resolving the longest matching module prefix in get_code_from_identifier before traversing attributes.
• Addressed the case where an outer and inner function share the same decorator wrapper by returning None (falling back to default pickling) instead of raising ValueError('Qual name parts too long') when a branch does not match the full __qualname__.

[codecov]

Codecov Report

❌ Patch coverage is 86.44068% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.91%. Comparing base (a8d6afd) to head (1afac1e).
⚠️ Report is 112 commits behind head on master.

Files with missing lines	Patch %	Lines
...python/apache_beam/internal/code_object_pickler.py	86.44%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #40711      +/-   ##
==========================================
- Coverage   80.04%   79.91%   -0.14%     
==========================================
  Files         490      493       +3     
  Lines       82916    83500     +584     
==========================================
+ Hits        66373    66726     +353     
- Misses      16543    16774     +231     

Flag	Coverage Δ
python	79.91% <86.44%> (-0.14%)	⬇️

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