Adding airgap support for list packages command

[pokearu]

Issue https://github.com/aws/eks-anywhere-internal/issues/2270

Description of changes:
Added support for list packages in an air gapped admin env.

Testing:

./eksctl anywhere list packages --cluster airgap-cluster  --bundles-override ./release-bundle.yaml -v6

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[codecov]

Codecov Report

Attention: Patch coverage is 17.64706% with 14 lines in your changes missing coverage. Please review.

Project coverage is 73.41%. Comparing base (fb5da43) to head (cf5eb45).
Report is 9 commits behind head on main.

Files	Patch %	Lines
cmd/eksctl-anywhere/cmd/listpackages.go	6.66%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8286      +/-   ##
==========================================
- Coverage   73.44%   73.41%   -0.04%     
==========================================
  Files         578      578              
  Lines       36101    36174      +73     
==========================================
+ Hits        26515    26557      +42     
- Misses       7908     7929      +21     
- Partials     1678     1688      +10     

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[pokearu]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pokearu

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[sp1999]

/cherry-pick release-0.19

[eks-distro-pr-bot]

@sp1999: new pull request created: #8864

In response to this:

/cherry-pick release-0.19

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