[release/v1.57.x] Prepare release 1.57.0

[otelbot]

Prepare release 1.57.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (ada4e21) to head (637d0dd).

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/v1.57.x    #7899      +/-   ##
=====================================================
+ Coverage              90.05%   90.10%   +0.04%     
- Complexity              7323     7326       +3     
=====================================================
  Files                    825      825              
  Lines                  22051    22051              
  Branches                2179     2179              
=====================================================
+ Hits                   19859    19868       +9     
+ Misses                  1513     1504       -9     
  Partials                 679      679              

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