Fix principal in Jakarta SecurityContext when using SSO #25356
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WebPrincipal was not serializable because of this fix: #25290, which caused exceptions in SSO mechanism, like this:
This PR moves the thread local variable to the static context so that it's not serialized together with securityContext instance. The value is only relevant within a scope of a specific request, and thus within a specific thread, so it doesn't have to be attached to a specific security context instance.