OCM-6822 | fix: use cluster name in error message

[chenz4027]

https://issues.redhat.com/browse/OCM-6822

Error now shows the cluster name instead of cluster id:

E: failed to create an external authentication provider for cluster 'magchen-hcp': external_auth.issuer.audiences must contain at least one audience

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 21.86%. Comparing base (92a2ed3) to head (43ada2f).
Report is 2 commits behind head on master.

Files	Patch %	Lines
pkg/externalauthprovider/flags.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1875      +/-   ##
==========================================
+ Coverage   21.81%   21.86%   +0.04%     
==========================================
  Files         117      117              
  Lines       18920    18932      +12     
==========================================
+ Hits         4128     4139      +11     
- Misses      14481    14482       +1     
  Partials      311      311              

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[marcolan018]

/lgtm

[gdbranco]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chenz4027, gdbranco, marcolan018

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[openshift-ci]

@chenz4027: all tests passed!

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