fix: correct fingerprinting and common enhancer call

[Jiahui-Zhang-20]

Issues Addressed:

1. If the involved object has owners, then the fingerprint now only includes the owners' kind and name so all objects with the same root owner are grouped. For example, if the involved object is a pod and it is owned by a deployment, the fingerprint will not include Pod or <pod_name> but instead Deployment and <deployment_name>.
2. Currently, the general enhancer only supports a subset of workload resource objects (Pod, Job, CronJob, ReplicaSet, Deployment) but not others (e.g. Node, Service, StatefulSet). We now call the common enhancer on the involved object regardless of whether the general enhancer supports that object. This way, the event message can at least be enhanced if needed.

[codecov]

Codecov Report

Attention: 50 lines in your changes are missing coverage. Please review.

Comparison is base (ea40479) 25.59% compared to head (4f9106e) 27.19%.

Files	Patch %	Lines
enhancers.go	54.54%	45 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   25.59%   27.19%   +1.59%     
==========================================
  Files          22       22              
  Lines        1633     1651      +18     
==========================================
+ Hits          418      449      +31     
+ Misses       1175     1157      -18     
- Partials       40       45       +5     

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