[chore] Promote Braydon Kains to triager (#36614)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->

Promotes @braydonk to triager role.

- PRs reviewed:
https://github.com/open-telemetry/opentelemetry-collector-contrib/pulls?q=is%3Apr+reviewed-by%3Abraydonk+
- PRs authored:
https://github.com/open-telemetry/opentelemetry-collector-contrib/pulls?q=is%3Apr+author%3Abraydonk+
- Issues created:
https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aissue+author%3Abraydonk+
- Issues commented:
https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aissue+commenter%3Abraydonk+
- Commits:
https://github.com/open-telemetry/opentelemetry-collector-contrib/commits?author=braydonk

cc @open-telemetry/collector-contrib-triagers

README.md

@@ -75,6 +75,7 @@ Triagers ([@open-telemetry/collector-contrib-triagers](https://github.com/orgs/o
 - [Murphy Chen](https://github.com/Frapschen), DaoCloud
 - [Paulo Janotti](https://github.com/pjanotti), Splunk
 - [Vihas Makwana](https://github.com/VihasMakwana), Elastic
+- [Braydon Kains](https://github.com/braydonk), Google
 - Actively seeking contributors to triage issues
 
 Emeritus Triagers: