Spring Add title to SockJS iFrames for accessibility compliance

Backport of #29594

Comment From: sbrannen

Closed in 332d2a36bb92021739ad5a083923467bf21be6ef, 92af390ed28464975e59cf597855fbabca8db141, and 5e55558a9364dd6e5d35d7f425bde40f8ecb70e0.