Attribute error fix for retry policy

[gavin-aguiar]

Description

With the current release, python worker was failing with the following error
Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcException : Result: Failure Exception: AttributeError: 'Function' object has no attribute 'get_settings_dict' Stack: File '/azure-functions-host/workers/python/3.9/LINUX/X64/azure_functions_worker/dispatcher.py', line 345, in _handle__functions_metadata_request fx_metadata_results = self.index_functions(function_path) File '/azure-functions-host/workers/python/3.9/LINUX/X64/azure_functions_worker/dispatcher.py', line 622, in index_functions fx_metadata_results = loader.process_indexed_function( File '/azure-functions-host/workers/python/3.9/LINUX/X64/azure_functions_worker/loader.py', line 109, in process_indexed_function retry_protos = build_retry_protos(indexed_function) File '/azure-functions-host/workers/python/3.9/LINUX/X64/azure_functions_worker/loader.py', line 69, in build_retry_protos retry = indexed_function.get_settings_dict(RETRY_POLICY)

This error is caused in dedicated due the python worker using the library that the customer brings in. To fix this error we check if the get_settings_api attribute exists and then proceed with retry policy else set retry policy to None

Fixes #

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[codecov]

Codecov Report

Merging #1322 (5371466) into dev (82b988e) will decrease coverage by 53.37%.
The diff coverage is 21.05%.

❗ Current head 5371466 differs from pull request most recent head 6e3d652. Consider uploading reports for the commit 6e3d652 to get more accurate results

@@             Coverage Diff             @@
##              dev    #1322       +/-   ##
===========================================
- Coverage   85.46%   32.09%   -53.37%     
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  Files          34       34               
  Lines        1926     1938       +12     
  Branches      366      366               
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- Hits         1646      622     -1024     
- Misses        209     1315     +1106     
+ Partials       71        1       -70     

Flag	Coverage Δ
unittests	32.09% <21.05%> (-53.32%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
azure_functions_worker/loader.py	31.57% <21.05%> (-55.68%)	⬇️

... and 23 files with indirect coverage changes