OCM-6822 | fix: add validations for external auth

[chenz4027]

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

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 21.05%. Comparing base (897b1c3) to head (84e46fd).
Report is 6 commits behind head on master.

Files	Patch %	Lines
cmd/list/externalauthprovider/cmd.go	50.00%	1 Missing and 1 partial ⚠️
cmd/describe/externalauthprovider/cmd.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1865      +/-   ##
==========================================
+ Coverage   20.92%   21.05%   +0.12%     
==========================================
  Files         103      104       +1     
  Lines       17343    17690     +347     
==========================================
+ Hits         3629     3724      +95     
- Misses      13439    13688     +249     
- Partials      275      278       +3     

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[philipwu08]

lgtm

[robpblake]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chenz4027, robpblake

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[openshift-ci]

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