Verify eksarelease exists on mgmt cluster

[tatlat]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

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[eks-distro-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (c1479be) 71.69% compared to head (03806e4) 71.73%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
cmd/eksctl-anywhere/cmd/createcluster.go	0.00%	4 Missing ⚠️
controllers/cluster_controller.go	83.33%	2 Missing and 1 partial ⚠️
cmd/eksctl-anywhere/cmd/upgradecluster.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7231      +/-   ##
==========================================
+ Coverage   71.69%   71.73%   +0.04%     
==========================================
  Files         548      552       +4     
  Lines       42789    42938     +149     
==========================================
+ Hits        30676    30801     +125     
- Misses      10407    10430      +23     
- Partials     1706     1707       +1     

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[g-gaston]

/lgtm

[tatlat]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tatlat

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