Update CHANGELOGs with 3.4.45, 3.5.31, 3.6.12, 3.7.0-rc.0 and 3.8.0 releases

[ivanvc]

Link to #21841, #21842, #21843.

[k8s-ci-robot]

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[k8s-ci-robot]

@ivanvc: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-integration-2-cpu-amd64	57e7507	link	true	/test pull-etcd-integration-2-cpu-amd64

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.76%. Comparing base (9ed485d) to head (57e7507).

Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21876      +/-   ##
==========================================
- Coverage   69.79%   69.76%   -0.04%     
==========================================
  Files         449      449              
  Lines       38208    38208              
==========================================
- Hits        26669    26655      -14     
- Misses      10114    10124      +10     
- Partials     1425     1429       +4     

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