fix: eliminate some linting warnings/errors

[Jiahui-Zhang-20]

No description provided.

[codecov]

Codecov Report

Attention: 66 lines in your changes are missing coverage. Please review.

Comparison is base (8f9b884) 30.11% compared to head (6a966d8) 29.93%.

Files	Patch %	Lines
integrations_gke.go	0.00%	17 Missing ⚠️
crons.go	0.00%	14 Missing ⚠️
enhancers.go	38.46%	8 Missing ⚠️
cluster_config.go	0.00%	5 Missing ⚠️
informers.go	0.00%	4 Missing ⚠️
main.go	0.00%	4 Missing ⚠️
enhancers_common.go	57.14%	2 Missing and 1 partial ⚠️
watcher_events.go	75.00%	2 Missing and 1 partial ⚠️
watcher_pods.go	70.00%	2 Missing and 1 partial ⚠️
informer_cronjobs.go	0.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   30.11%   29.93%   -0.18%     
==========================================
  Files          22       22              
  Lines        1624     1640      +16     
==========================================
+ Hits          489      491       +2     
- Misses       1086     1098      +12     
- Partials       49       51       +2     

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