[release-0.21] Get a random subnet id from a list of subnet ids

[eks-distro-pr-bot]

This is an automated cherry-pick of #9042

/assign panktishah26

[eks-distro-bot]

Hi @eks-distro-pr-bot. Thanks for your PR.

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[eks-distro-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-0.21@913fcae). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
internal/pkg/ec2/create.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-0.21    #9056   +/-   ##
===============================================
  Coverage                ?   72.36%           
===============================================
  Files                   ?      578           
  Lines                   ?    45419           
  Branches                ?        0           
===============================================
  Hits                    ?    32866           
  Misses                  ?    10823           
  Partials                ?     1730           

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