OCM-6820 | fix: add checks for mandatory parameters

[chenz4027]

https://issues.redhat.com/browse/OCM-6820

[codecov]

Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 21.70%. Comparing base (0c0f1c3) to head (f61cbc9).
Report is 10 commits behind head on master.

Files	Patch %	Lines
pkg/externalauthprovider/flags.go	46.66%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1884      +/-   ##
==========================================
- Coverage   21.81%   21.70%   -0.11%     
==========================================
  Files         117      117              
  Lines       18929    19575     +646     
==========================================
+ Hits         4129     4249     +120     
- Misses      14489    14947     +458     
- Partials      311      379      +68     

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[hunterkepley]

if tests pass LGTM 🙂

[ciaranRoche]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[chenz4027]

/retest

[chenz4027]

/retest

[chenz4027]

/retest

[openshift-ci]

@chenz4027: all tests passed!

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