perf(oidc): optimize client verification (#6999)

* fix some spelling errors

* client credential auth

* implementation of client auth

* improve error handling

* unit test command package

* unit test database package

* unit test query package

* cleanup unused tracing func

* fix integration tests

* errz to zerrors

* fix linting and import issues

* fix another linting error

* integration test with client secret

* Revert "integration test with client secret"

This reverts commit 0814ba522f.

* add integration tests

* client credentials integration test

* resolve comments

* pin oidc v3.5.0

internal/api/grpc/user/converter.go

@@ -72,7 +72,7 @@ func MachineToPb(view *query.Machine) *user_pb.Machine {
 	return &user_pb.Machine{
 		Name:            view.Name,
 		Description:     view.Description,
-		HasSecret:       view.HasSecret,
+		HasSecret:       view.Secret != nil,
 		AccessTokenType: AccessTokenTypeToPb(view.AccessTokenType),
 	}
 }