fix iam kubeconfig generation in workload clusters

[tatlat]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.36%. Comparing base (e97188b) to head (a6b8317).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/clustermanager/cluster_manager.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9048      +/-   ##
==========================================
- Coverage   72.37%   72.36%   -0.01%     
==========================================
  Files         578      578              
  Lines       45436    45436              
==========================================
- Hits        32883    32880       -3     
- Misses      10823    10825       +2     
- Partials     1730     1731       +1     

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[eks-distro-bot]

@tatlat: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
eks-anywhere-presubmit	a6b8317	link	true	/test eks-anywhere-presubmit

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[tatlat]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tatlat

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[tatlat]

/cherry-pick release-0.21

[eks-distro-pr-bot]

@tatlat: new pull request created: #9049

In response to this:

/cherry-pick release-0.21

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