Add --insecure flag to download images command

[wongni]

Issue #, if available: #2878

Description of changes: Add --insecure flag to download images command

Testing (if applicable): Manual test with and without --insecure on download images command

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[codecov[bot]]

Codecov Report

Merging #2879 (cb2a10e) into main (91ee5de) will decrease coverage by 0.14%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2879      +/-   ##
==========================================
- Coverage   62.03%   61.88%   -0.15%     
==========================================
  Files         328      328              
  Lines       26452    26503      +51     
==========================================
- Hits        16409    16402       -7     
- Misses       8777     8837      +60     
+ Partials     1266     1264       -2     

Impacted Files	Coverage Δ
pkg/dependencies/factory.go	67.87% <100.00%> (-0.06%)	:arrow_down:
...roviders/tinkerbell/hardware/catalogue_hardware.go	81.46% <0.00%> (-10.85%)	:arrow_down:
pkg/executables/kubectl.go	42.52% <0.00%> (-0.75%)	:arrow_down:
pkg/providers/tinkerbell/upgrade.go	0.00% <0.00%> (ø)
pkg/providers/tinkerbell/tinkerbell.go	33.79% <0.00%> (ø)
pkg/curatedpackages/packagecontrollerclient.go	96.20% <0.00%> (+0.09%)	:arrow_up:
pkg/providers/tinkerbell/template.go	32.30% <0.00%> (+0.22%)	:arrow_up:

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[eks-distro-bot]

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