Add changelog for deprecated/removed otelgrpc API

[dims]

Please see #20043

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.41%. Comparing base (b3b9e98) to head (c84b416).
Report is 2 commits behind head on main.

Additional details and impacted files

see 59 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20045      +/-   ##
==========================================
+ Coverage   66.85%   67.41%   +0.55%     
==========================================
  Files         424      422       -2     
  Lines       35756    35691      -65     
==========================================
+ Hits        23905    24060     +155     
+ Misses      10446    10220     -226     
- Partials     1405     1411       +6     

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