Enhance logging in EventWatcher

[t-kikuc]

What this PR does:

1. Add logger.Error() before returning (cedc8f2)
2. Add some git info in logger.Error(). (7dd40c7)

IMO, we should add a logger to git.Repo too.

Why we need it:

• To make debugging EventWatcher easier
• To follow the new logging convention

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[Warashi]

👍🏻

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes missing coverage. Please review.

Project coverage is 26.24%. Comparing base (bcdba1f) to head (7dd40c7).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/piped/eventwatcher/eventwatcher.go	0.00%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5443      +/-   ##
==========================================
- Coverage   26.25%   26.24%   -0.01%     
==========================================
  Files         452      452              
  Lines       48860    48886      +26     
==========================================
+ Hits        12827    12831       +4     
- Misses      35008    35031      +23     
+ Partials     1025     1024       -1     

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[ffjlabo]

👍