[ci] Properly format commit message (#32668)

Using the github variable for the commit message replaces the variable
inline. If the commit message contains quotes or other characters that
need to be escaped, this breaks the workflow.
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/32668).
* #32669
* __->__ #32668