Merge pull request #46786 from grodrigues3/create-sig-leads-section

Automatic merge from submit-queue (batch tested with PRs 46681, 46786, 46264, 46680, 46805)

Added sig leads alias to OWNERS_ALIAS

**What this PR does / why we need it**:

Add sig leads section to OWNERS_ALIASES so sig leads without maintainers access can add status labels to issues (important to 1.7 milestone)

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

**Special notes for your reviewer**:

Let me know you know of additional sig leads that should be added.

**Release note**:

```NONE
```

OWNERS_ALIASES

@@ -79,3 +79,5 @@ aliases:
  sig-apps-api-approvers:
  - erictune
  - smarterclayton
+ sig-leads:
+ - spiffxp