Get a random subnet id from a list of subnet ids

[panktishah26]

Description of changes:

Our e2e tests are failing with the below error,

InsufficientInstanceCapacity: We currently do not have sufficient t3.2xlarge capacity in the Availability Zone you requested (***a). Our system will be working on provisioning additional capacity. You can currently get t3.2xlarge capacity by not specifying an Availability Zone in your request or choosing ***b, ***c, ***d.

Getting a random subnet id from the string containing multiple subnet ids to fix the above issue.

Testing (if applicable):

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

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

Project coverage is 72.41%. Comparing base (195ea65) to head (f58377c).
Report is 3 commits behind head on main.

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

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9042      +/-   ##
==========================================
- Coverage   72.42%   72.41%   -0.01%     
==========================================
  Files         578      578              
  Lines       45403    45406       +3     
==========================================
  Hits        32883    32883              
- Misses      10790    10793       +3     
  Partials     1730     1730              

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[abhay-krishna]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhay-krishna

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[panktishah26]

/cherry-pick release-0.20
/cherry-pick release-0.21

[eks-distro-pr-bot]

@panktishah26: new pull request created: #9055

In response to this:

/cherry-pick release-0.20
/cherry-pick release-0.21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[panktishah26]

/cherry-pick release-0.21

[eks-distro-pr-bot]

@panktishah26: new pull request could not be created: failed to create pull request against aws/eks-anywhere#release-0.20 from head eks-distro-pr-bot:cherry-pick-9042-to-release-0.20: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for eks-distro-pr-bot:cherry-pick-9042-to-release-0.20."}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request","status":"422"}

In response to this:

/cherry-pick release-0.20
/cherry-pick release-0.21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[eks-distro-pr-bot]

@panktishah26: new pull request created: #9056

In response to this:

/cherry-pick release-0.21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.