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/eventstore/repository/mock/repository.mock.impl.go

@@ -75,11 +75,15 @@ func (m *MockRepository) ExpectInstanceIDsError(err error) *MockRepository {
 	return m
 }
 
-func (m *MockRepository) ExpectPush(expectedCommands []eventstore.Command) *MockRepository {
+// ExpectPush checks if the expectedCommands are send to the Push method.
+// The call will sleep at least the amount of passed duration.
+func (m *MockRepository) ExpectPush(expectedCommands []eventstore.Command, sleep time.Duration) *MockRepository {
 	m.MockPusher.EXPECT().Push(gomock.Any(), gomock.Any()).DoAndReturn(
 		func(ctx context.Context, commands ...eventstore.Command) ([]eventstore.Event, error) {
 			m.MockPusher.ctrl.T.Helper()
 
+			time.Sleep(sleep)
+
 			if len(expectedCommands) != len(commands) {
 				return nil, fmt.Errorf("unexpected amount of commands: want %d, got %d", len(expectedCommands), len(commands))
 			}