fix: surface plugin error in exec.go

[susanshi]

Description

What this PR does / why we need it:

Currently the plugin error from executing the command is not exposed. This PR provides the fix
Fixes #1221 1221

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

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

Comparison is base (49f63e1) 55.15% compared to head (cac50f5) 55.31%.

Files	Patch %	Lines
pkg/common/plugin/exec.go	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1228      +/-   ##
==========================================
+ Coverage   55.15%   55.31%   +0.15%     
==========================================
  Files         104      104              
  Lines        6902     6902              
==========================================
+ Hits         3807     3818      +11     
+ Misses       2760     2749      -11     
  Partials      335      335              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[binbin-li]

lgtm overall