Add known issues to changelog and readme

[yunchu]

Summary

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (f617ff0) to head (8c5f7f1).

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/2.1.0    #3722      +/-   ##
==================================================
- Coverage           80.74%   80.63%   -0.11%     
==================================================
  Files                 253      253              
  Lines               25696    25696              
==================================================
- Hits                20748    20721      -27     
- Misses               4948     4975      +27     

Flag	Coverage Δ
py310	?
py311	80.63% <ø> (+0.25%)	⬆️

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