[#2232] Resubmit without login

[lprimak]

fixes #2232

Summary

Shiro's Jakarta EE support can now resubmit a form after session expiry without a login page or "session expired" screen, and the resubmission mechanism itself has been reworked to be safer and more robust.

What changed

• Replay without a login flow: when a POST arrives with a session id that no longer resolves to a session, and the subject is remembered or anonymous, the saved form is replayed in place as soon as the security chain permits it. Pages that require login still save the form and replay it after login. Only same-origin application/x-www-form-urlencoded submissions are replayed in place. With client-side Faces state saving no in-place replay is needed, since the view state travels with the request and is not lost with the session; replay after login still works.

Testing

New unit tests (FormResubmitRequestTest, FormResubmitResponseTest, FormResubmitSupportCookiesTest, SavedFormDataTest, DirectResubmitCandidateTest, updated FormSupportTest) and expanded integration tests in ShiroAuthFormsIT with a new unprotected form page.

Note

Stacked on top of, and depends on #2900

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