[Backport] Add 2.11 release notes

[RS146BIJAY]

Description

Backport #446

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (2.x@8a0cea6). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head e359cef differs from pull request most recent head b3b3548. Consider uploading reports for the commit b3b3548 to get more accurate results

@@          Coverage Diff           @@
##             2.x     #452   +/-   ##
======================================
  Coverage       ?   83.87%           
  Complexity     ?      556           
======================================
  Files          ?       61           
  Lines          ?     2046           
  Branches       ?      146           
======================================
  Hits           ?     1716           
  Misses         ?      232           
  Partials       ?       98