CookieRequestCache should set SameSite on the REDIRECT_URI cookie #15204

Describe the bug
When using CookieRequestCache, Firefox complains:

Cookie “REDIRECT_URI” does not have a proper “SameSite” attribute value. Soon, cookies without the “SameSite” attribute or with an invalid value will be treated as “Lax”. This means that the cookie will no longer be sent in third-party contexts. If your application depends on this cookie being available in such contexts, please add the “SameSite=None“ attribute to it. To know more about the “SameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite

To Reproduce
Configure your application to use CookieRequestCache, like so:

http.requestCache(config -> config.requestCache(new CookieRequestCache()));

Note that due to #2932 you likely also need to separately pass the CookieRequestCache to SavedRequestAwareAuthenticationSuccessHandler.

Expected behavior
No warning in Firefox. The POST /login request should also not show up as “blocked”.

Sample

No sample provided. This is easy to try on any project.