Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>..

Move other release notes out of CHANGELOG.md

**What this PR does / why we need it**:
Move 1.4, 1.5, 1.6 release notes out of CHANGELOG.md.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
ref: #48985 #52174 #52518

**Special notes for your reviewer**:
Not move 1.7 release notes yet. I don't think we want to move it out of CHANGELOG.md until 1.8 is released.
/cc @jdumars @dchen1107

**Release note**:

```release-note
NONE
```