chore: update jwtProfileKeySet to match actual use

[muir]

What is actually stored in jwtProfileKeySet is a client id. It is not a user id.
This change makes no functional difference, it just removes some naming technical debt.

[codecov]

Codecov Report

Merging #219 (d90be35) into main (0e7949b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #219      +/-   ##
==========================================
- Coverage   12.47%   12.46%   -0.02%     
==========================================
  Files          41       41              
  Lines        3263     3266       +3     
==========================================
  Hits          407      407              
- Misses       2845     2848       +3     
  Partials       11       11              

Impacted Files	Coverage Δ
pkg/op/auth_request.go	43.83% <0.00%> (ø)
pkg/op/verifier_jwt_profile.go	0.00% <0.00%> (ø)
pkg/oidc/userinfo.go	39.62% <0.00%> (-0.51%)	⬇️
pkg/oidc/introspection.go	0.00% <0.00%> (ø)

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[github-actions]

🎉 This PR is included in version 1.8.1 🎉

The release is available on GitHub release

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