Remove kindless upgrade feature flag for all the providers

[panktishah26]

Description of changes:
Do not create a kind cluster to upgrade the management cluster of all the providers.

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: 1 lines in your changes are missing coverage. Please review.

Comparison is base (58a6ca5) 72.01% compared to head (745eef4) 71.96%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6879      +/-   ##
==========================================
- Coverage   72.01%   71.96%   -0.06%     
==========================================
  Files         532      532              
  Lines       41644    41601      -43     
==========================================
- Hits        29991    29938      -53     
- Misses       9980     9987       +7     
- Partials     1673     1676       +3     

Files	Coverage Δ
pkg/api/v1alpha1/cluster_webhook.go	93.66% <100.00%> (+0.85%)	⬆️
pkg/api/v1alpha1/vspheremachineconfig_webhook.go	83.52% <ø> (-4.16%)	⬇️
pkg/clustermanager/eksa_installer.go	81.08% <100.00%> (-4.54%)	⬇️
pkg/controller/clusters/clusterapi.go	84.21% <100.00%> (-7.22%)	⬇️
pkg/features/features.go	19.04% <ø> (+5.25%)	⬆️
cmd/eksctl-anywhere/cmd/upgradecluster.go	7.10% <0.00%> (-0.09%)	⬇️

... and 3 files with indirect coverage changes

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[panktishah26]

/test eks-anywhere-presubmit

[eks-distro-bot]

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[panktishah26]

/cherrypick release-0.18

[eks-distro-pr-bot]

@panktishah26: once the present PR merges, I will cherry-pick it on top of release-0.18 in a new PR and assign it to you.

In response to this:

/cherrypick release-0.18

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.

[cxbrowne1207]

/lgtm

[eks-distro-pr-bot]

@panktishah26: new pull request created: #6886

In response to this:

/cherrypick release-0.18

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.