Add unit test for pkg/antctl/raw/supportbundle

[NamanAg30]

For #4142
Signed-off-by: Naman Agarwal naman.agarwal75@gmail.com

[codecov]

Codecov Report

Merging #4596 (8cee898) into main (b74f9fe) will increase coverage by 0.13%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4596      +/-   ##
==========================================
+ Coverage   68.25%   68.38%   +0.13%     
==========================================
  Files         400      400              
  Lines       58324    58324              
==========================================
+ Hits        39808    39886      +78     
+ Misses      15759    15667      -92     
- Partials     2757     2771      +14     

Flag	Coverage Δ		*Carryforward flag
e2e-tests	38.34% <ø> (ø)		Carriedforward from b74f9fe
integration-tests	34.56% <ø> (-0.05%)	⬇️
kind-e2e-tests	46.79% <ø> (+0.15%)	⬆️
unit-tests	57.92% <0.00%> (ø)		Carriedforward from b74f9fe

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
pkg/antctl/raw/supportbundle/command.go	3.40% <0.00%> (ø)
pkg/agent/util/ethtool/ethtool_linux.go	0.00% <0.00%> (-70.00%)	⬇️
pkg/agent/cniserver/ipam/ipam_service.go	83.14% <0.00%> (-8.99%)	⬇️
pkg/agent/cniserver/ipam/antrea_ipam.go	75.75% <0.00%> (-4.33%)	⬇️
pkg/agent/consistenthash/consistenthash.go	93.75% <0.00%> (-3.75%)	⬇️
pkg/agent/cniserver/server.go	74.94% <0.00%> (-3.44%)	⬇️
...rs/multicluster/member/serviceexport_controller.go	76.33% <0.00%> (-2.80%)	⬇️
pkg/agent/cniserver/ipam/ipam_delegator.go	68.18% <0.00%> (-1.52%)	⬇️
pkg/agent/controller/networkpolicy/reconciler.go	70.45% <0.00%> (-1.45%)	⬇️
pkg/ovs/ovsconfig/ovs_client.go	66.70% <0.00%> (-0.49%)	⬇️
... and 13 more