Improve error handling for local execution

[pingsutw]

Tracking issue

NA

Why are the changes needed?

Improve error messages

What changes were proposed in this pull request?

• Remove duplicate error message
• Remove traceback from user_entry_point

How was this patch tested?

pyflyte run pyflyte run train_wf.py wf

Before:

After:

pyflyte --verbose run pyflyte run train_wf.py wf

Before:

After:

Check all the applicable boxes

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

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (68430db) 84.81% compared to head (49f7d44) 85.65%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
flytekit/extend/backend/base_agent.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2068      +/-   ##
==========================================
+ Coverage   84.81%   85.65%   +0.84%     
==========================================
  Files         267      309      +42     
  Lines       21068    23248    +2180     
  Branches     3491     3501      +10     
==========================================
+ Hits        17869    19914    +2045     
- Misses       2592     2726     +134     
- Partials      607      608       +1     

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[kumare3]

thank you for doing this, i was about to fix this annoying thing