Fix iam auth role upgrades

[pokearu]

Issue #3390

Description of changes:
Changes enable detection of diff in the cluster config for AWSIamConfig MapRoles and MapUsers during upgrade.

Testing:

./eksctl-anywhere upgrade cluster -f ./eks-a-cluster.yaml

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[codecov]

Codecov Report

Merging #3399 (85eb3bf) into main (9d56db8) will decrease coverage by 0.02%.
The diff coverage is 46.34%.

@@            Coverage Diff             @@
##             main    #3399      +/-   ##
==========================================
- Coverage   64.87%   64.85%   -0.03%     
==========================================
  Files         352      352              
  Lines       28357    28394      +37     
==========================================
+ Hits        18397    18415      +18     
- Misses       8648     8666      +18     
- Partials     1312     1313       +1     

Impacted Files	Coverage Δ
controllers/resource/fetcher.go	40.26% <0.00%> (-0.56%)	⬇️
pkg/cluster/spec.go	63.47% <0.00%> (-0.92%)	⬇️
pkg/cluster/fetch.go	45.58% <44.44%> (+0.58%)	⬆️
pkg/clustermanager/cluster_manager.go	62.90% <100.00%> (+0.50%)	⬆️

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[abhinavmpandey08]

/lgtm
/approve
/woof

[eks-distro-bot]

@abhinavmpandey08:

In response to this:

/lgtm
/approve
/woof

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[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavmpandey08

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[pokearu]

/cherrypick release-0.11

[eks-distro-pr-bot]

@pokearu: new pull request created: #3460

In response to this:

/cherrypick release-0.11

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