feat: loadtester support kubectl type

[mumubin]

Our project want to run a kubernetes job/pod for canary test.
But I didn't find a way to start a kubernetes job/pod except helm.
So this PR provide kubectl command

Fixes: #1478

[aryan9600]

LGTM! thanks @mumubin 🏅

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.24% ⚠️

Comparison is base (7fc007a) 54.56% compared to head (084daaf) 54.33%.

❗ Current head 084daaf differs from pull request most recent head f685a45. Consider uploading reports for the commit f685a45 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1485      +/-   ##
==========================================
- Coverage   54.56%   54.33%   -0.24%     
==========================================
  Files          84       85       +1     
  Lines       10143    10186      +43     
==========================================
  Hits         5535     5535              
- Misses       3953     3996      +43     
  Partials      655      655              

Files Changed	Coverage Δ
pkg/loadtester/kubectl.go	0.00% <0.00%> (ø)
pkg/loadtester/server.go	12.07% <0.00%> (-0.88%)	⬇️

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[mumubin]

LGTM! thanks @mumubin 🏅

Thanks for your review.
I see that the test coverage has dropped a bit, do these need to be paid attention to?
I want to imitate the command of helmv3 to supplement the test, but I can't find the helmv3 test code.

[aryan9600]

I see that the test coverage has dropped a bit, do these need to be paid attention to?

no, its fine for now, thanks for your contribution :)