test(oidc): test OIDC login and refresh flow

- ensure Oxicloud s correctly functional with OIDC login
    - refresh token works
    - givenname, familyname, picture are imported in users' informations
    - test relogin (server is not using same path)
    - test email verified
    - test admin group provided from IdP

tests/oidc/test.env

@@ -0,0 +1,12 @@
+# Variables fed to Hurl for the OIDC integration tests.
+# Mirror tests/api/test.env so the same admin-setup flow works on top
+# of the OIDC-enabled server binary.
+base_url=http://localhost:8087
+username=admin
+email=admin@example.com
+# gitguardian:ignore
+password=TestPassword1!
+# Discovery / authorize endpoints exposed by tests/oidc/fake_idp.
+# oidc-provider publishes authorize at /auth (not /authorize) by default.
+oidc_issuer=http://localhost:1080
+oidc_authorize_endpoint=http://localhost:1080/auth