Add a validation if the controller is paused during cluster upgrade

[panktishah26]

Issue #, if available:
https://github.com/aws/eks-anywhere-internal/issues/2189

Description of changes:
We have enabled controller for all the cluster operations. Cluster upgrade process succeds and doesn't show any error if the customer pauses controller reconciler manually by annotating cluster with anywhere.eks.amazonaws.com/paused=true annotation. With this PR, the cluster upgrade command will give following error if the cluster reconciler is paused before upgrading the cluster.

❌ Validation failed {"validation": "validate eksa controller is not paused", "error": "remove cluster controller reconciliation pause annotation anywhere.eks.amazonaws.com/paused before upgrading cluster docker", "remediation": "ensure cluster controller reconciliation is not paused manually before upgrading the cluster"}

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (4583834) 73.48% compared to head (48f4077) 73.54%.
Report is 63 commits behind head on main.

Files	Patch %	Lines
pkg/providers/tinkerbell/validate.go	73.68%	4 Missing and 1 partial ⚠️
release/api/v1alpha1/artifacts.go	0.00%	4 Missing ⚠️
pkg/workflows/management/secrets.go	80.00%	3 Missing ⚠️
pkg/clustermanager/cluster_manager.go	88.23%	2 Missing ⚠️
pkg/providers/nutanix/controlplane.go	92.00%	1 Missing and 1 partial ⚠️
pkg/validations/cluster.go	71.42%	1 Missing and 1 partial ⚠️
pkg/workflows/management/create_workload.go	71.42%	1 Missing and 1 partial ⚠️
pkg/workflows/workload/create_gitops.go	84.61%	2 Missing ⚠️
pkg/workflows/workload/post_delete.go	84.61%	2 Missing ⚠️
cmd/eksctl-anywhere/cmd/deletecluster.go	0.00%	1 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7585      +/-   ##
==========================================
+ Coverage   73.48%   73.54%   +0.05%     
==========================================
  Files         579      580       +1     
  Lines       36357    36562     +205     
==========================================
+ Hits        26718    26890     +172     
- Misses       7875     7905      +30     
- Partials     1764     1767       +3     

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