Merge pull request #51848 from xiangpengzhao/milestone-label

Automatic merge from submit-queue

Update the label manifest with new milestone labels

**What this PR does / why we need it**:
Make the milestone labels more noticeable.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
ref: #51663

**Special notes for your reviewer**:
/cc @bgrant0607 @fejta
/assign @grodrigues3 @spxtr

**Release note**:

```release-note
NONE
```

labels.yaml

@@ -214,6 +214,10 @@ labels:
   color: fbca04
 - name: lgtm
   color: 15dd18
+- name: milestone-labels-complete
+  color: 77bb00
+- name: milestone-labels-incomplete
+  color: e11d21
 - name: needs-ok-to-merge
   color: ededed
 - name: needs-ok-to-test