Override the container image of map task

[pingsutw]

Tracking issue

flyteorg/flyte#4493

Describe your changes

This PR allows users to override the python_function_task inside of map task.

with_override doesn't work with map task since we didn't override the python_function_task inside of map task.

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Setup Process

import typing

from flytekit import task, workflow, map_task
# from flytekit.experimental import map_task

@task
def my_mappable_task(a: int) -> typing.Optional[str]:
    return str(a)


@workflow
def wf(x: typing.List[int]=[1, 2, 3, 5]) -> typing.List[typing.Optional[str]]:
    map_task(my_mappable_task, concurrency=10, min_success_ratio=0.75)(a=x)
    a = map_task(my_mappable_task, concurrency=10, min_success_ratio=0.75)(a=x).with_overrides(container_image="random:image")
    return a


if __name__ == '__main__':
    wf(x=[1, 2, 3])

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e5c3c78) 85.22% compared to head (7a30eb5) 86.16%.
Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2011      +/-   ##
==========================================
+ Coverage   85.22%   86.16%   +0.94%     
==========================================
  Files         287      320      +33     
  Lines       22072    23448    +1376     
  Branches     3528     3460      -68     
==========================================
+ Hits        18810    20204    +1394     
+ Misses       2659     2652       -7     
+ Partials      603      592      -11     

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