[release/v1.60.x] Prepare release 1.60.0

[otelbot]

Prepare release 1.60.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.29%. Comparing base (99857c6) to head (9efd905).
⚠️ Report is 1 commits behind head on release/v1.60.x.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/v1.60.x    #8151      +/-   ##
=====================================================
- Coverage              90.30%   90.29%   -0.01%     
  Complexity              7650     7650              
=====================================================
  Files                    843      843              
  Lines                  23059    23059              
  Branches                2309     2309              
=====================================================
- Hits                   20823    20821       -2     
- Misses                  1518     1519       +1     
- Partials                 718      719       +1     

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