Local dynamic execution was missing

[wild-endeavor]

TL;DR

Found out local execution of dynamic tasks was missing when investigating something

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

Add a case for execution mode LOCAL_TASK_EXECUTION

Tracking Issue

Found when debugging https://flyte-org.slack.com/archives/CREL4QVAQ/p1627384320463800

[codecov]

Codecov Report

Merging #569 (60781b1) into master (ccaac7d) will increase coverage by 0.01%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master     #569      +/-   ##
==========================================
+ Coverage   85.45%   85.47%   +0.01%     
==========================================
  Files         376      376              
  Lines       29225    29265      +40     
  Branches     2347     2350       +3     
==========================================
+ Hits        24975    25014      +39     
- Misses       3615     3616       +1     
  Partials      635      635              

Impacted Files	Coverage Δ
flytekit/core/python_function_task.py	87.50% <33.33%> (-0.62%)	⬇️
tests/flytekit/unit/core/test_dynamic.py	96.96% <100.00%> (+3.42%)	⬆️
flytekit/core/context_manager.py	93.54% <0.00%> (+0.04%)	⬆️

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