upstreamoidc: directly detect user info support

[enj]

Avoid reliance on an error string from the Core OS OIDC lib.

Signed-off-by: Monis Khan mok@vmware.com

Release note:

NONE

[codecov]

Codecov Report

Merging #852 (e864886) into main (ee0e240) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #852   +/-   ##
=======================================
  Coverage   78.61%   78.62%           
=======================================
  Files         129      129           
  Lines        8972     8976    +4     
=======================================
+ Hits         7053     7057    +4     
  Misses       1691     1691           
  Partials      228      228           

Impacted Files	Coverage Δ
internal/upstreamoidc/upstreamoidc.go	95.69% <100.00%> (+0.19%)	⬆️

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