chore(ci): Exclude generated files from CodeCov

[irvinlim]

Excludes Go files generated by controller-gen and generate-groups.

[codecov]

Codecov Report

Base: 64.45% // Head: 68.63% // Increases project coverage by +4.18% 🎉

Coverage data is based on head (fe830de) compared to base (551852d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   64.45%   68.63%   +4.18%     
==========================================
  Files         208      188      -20     
  Lines       11244     9584    -1660     
==========================================
- Hits         7247     6578     -669     
+ Misses       3605     2645     -960     
+ Partials      392      361      -31     

Impacted Files	Coverage Δ
pkg/generated/listers/execution/v1alpha1/job.go
...et/versioned/typed/execution/v1alpha1/jobconfig.go
apis/config/v1alpha1/zz_generated.deepcopy.go
...s/externalversions/execution/v1alpha1/jobconfig.go
...ed/typed/execution/v1alpha1/fake/fake_jobconfig.go
...ed/clientset/versioned/fake/clientset_generated.go
...g/generated/clientset/versioned/scheme/register.go
pkg/generated/clientset/versioned/clientset.go
...formers/externalversions/execution/v1alpha1/job.go
...kg/generated/informers/externalversions/generic.go
... and 11 more

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