CLI commands support for packages in airgapped admin

[pokearu]

Issues
https://github.com/aws/eks-anywhere-internal/issues/2252
https://github.com/aws/eks-anywhere-internal/issues/2270

Description of changes:
Below changes ensure that if a customer has a registry mirror setup as part of their EKS-A cluster config; we ensure to perform eksctl anywhere CLI commands for packages using the mirror.

This is significant for folks with an airgapped admin machine; when running these commands the CLI dependencies will know to be pulled from their mirror and not use public.ecr.aws .
Testing:

./eksctl-anywhere install packagecontroller -f ./regauth-cluster/regauth-cluster-eks-a-cluster.yaml

./eksctl-anywhere generate package harbor --cluster ramaliar-tink-regauth --kubeconfig ./regauth-cluster/regauth-cluster-eks-a-cluster.kubeconfig

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 73.40%. Comparing base (443a57f) to head (127ac54).
Report is 31 commits behind head on main.

Files	Patch %	Lines
cmd/eksctl-anywhere/cmd/generatepackage.go	0.00%	12 Missing ⚠️
cmd/eksctl-anywhere/cmd/common.go	0.00%	8 Missing ⚠️
...md/eksctl-anywhere/cmd/installpackagecontroller.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8026      +/-   ##
==========================================
- Coverage   73.44%   73.40%   -0.05%     
==========================================
  Files         577      577              
  Lines       35875    35896      +21     
==========================================
  Hits        26348    26348              
- Misses       7861     7882      +21     
  Partials     1666     1666              

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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: #8865

In response to this:

/cherry-pick release-0.19

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