add capi patch to enable kubeadm feature flags mutation

[abhinavmpandey08]

Description of changes:
Currently, kubeadm feature flags are immutable which cause issues when upgrading a cluster from 1.28 to 1.29 as we try to disable the EtcdLearnerMode feature flag. This gets blocked by webhooks because the feature flag itself is immutable.

This PR patches CAPI based on this upstream PR kubernetes-sigs/cluster-api#10154 to make this field mutable.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[tatlat]

/lgtm

[abhinavmpandey08]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavmpandey08

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[abhinavmpandey08]

/cherry-pick main

[eks-distro-pr-bot]

@abhinavmpandey08: #2958 failed to apply on top of branch "main":

Applying: add capi patch to enable kubeadm feature flags mutation
.git/rebase-apply/patch:68: space before tab in indent.
 		},
.git/rebase-apply/patch:69: space before tab in indent.
 	}
.git/rebase-apply/patch:70: space before tab in indent.
 	g.Expect(env.Create(ctx, kubeadmCM)).To(Succeed())
.git/rebase-apply/patch:76: space before tab in indent.
 	return nil
.git/rebase-apply/patch:78: trailing whitespace.
 
warning: squelched 480 whitespace errors
warning: 485 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	projects/kubernetes-sigs/cluster-api/CHECKSUMS
Falling back to patching base and 3-way merge...
Auto-merging projects/kubernetes-sigs/cluster-api/CHECKSUMS
CONFLICT (content): Merge conflict in projects/kubernetes-sigs/cluster-api/CHECKSUMS
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 add capi patch to enable kubeadm feature flags mutation
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick main

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.

[abhinavmpandey08]

/cherry-pick main

[eks-distro-pr-bot]

@abhinavmpandey08: new pull request created: #2966

In response to this:

/cherry-pick main

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.