Improve example_load_file DAG tasks names

[vatsrahul1001]

Description

What is the current behavior?

Currently, task names in example_load_file DAG are not provided due to which there sequence changes at runtime also task names are not descriptive

What is the new behavior?

1. adding task_id field in all the tasks
2. adding logical names for the tasks for better readability
3. Noticed a few tasks were duplicates, so removed them

[tatiana]

Thanks, @vatsrahul1001 , this will help users visualising the different load names. I'm happy for the change to be merged once the checks pass!

[vatsrahul1001]

Thanks, @vatsrahul1001 , this will help users visualising the different load names. I'm happy for the change to be merged once the checks pass!

thanks to @utkarsharma2 for helping me out in giving logical names to tasks

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.47 🎉

Comparison is base (bbb4541) 91.69% compared to head (ff03597) 92.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1958      +/-   ##
==========================================
+ Coverage   91.69%   92.16%   +0.47%     
==========================================
  Files          72       72              
  Lines        4250     4250              
  Branches      511      511              
==========================================
+ Hits         3897     3917      +20     
+ Misses        257      240      -17     
+ Partials       96       93       -3     

Flag	Coverage Δ
PythonSDK	92.16% <ø> (+0.47%)	⬆️

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see 7 files with indirect coverage changes

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