Mark python-dateutil as install required

[YunchuWang]

Description

Linux consumption tests are failing as module 'python-dateutil' not found error happening in #1004. The cause is current mesh image is installing worker deps from released worker version instead of setup.py from local or pr branch. We will also update linux consumption test to use v4 images so this change will be taken into runtime image.

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PR information

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• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1021 (24a76fa) into dev (5e5d250) will decrease coverage by 0.10%.
The diff coverage is n/a.

❗ Current head 24a76fa differs from pull request most recent head 042d9e5. Consider uploading reports for the commit 042d9e5 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1021      +/-   ##
==========================================
- Coverage   82.88%   82.77%   -0.11%     
==========================================
  Files          33       33              
  Lines        1776     1765      -11     
  Branches      282      282              
==========================================
- Hits         1472     1461      -11     
  Misses        234      234              
  Partials       70       70              

Flag	Coverage Δ
unittests	82.77% <ø> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
azure_functions_worker/dispatcher.py	89.09% <0.00%> (-0.03%)	⬇️
azure_functions_worker/extension.py	99.06% <0.00%> (-0.02%)	⬇️
azure_functions_worker/constants.py	100.00% <0.00%> (ø)
...ed_memory_data_transfer/shared_memory_constants.py	100.00% <0.00%> (ø)

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