[9.0] [Console] Fix typo in generated PR title (#209255) (#209466)

# Backport

This will backport the following commits from `main` to `9.0`:
- [[Console] Fix typo in generated PR title
(#209255)](#209255)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Fix typo in generated PR title
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Fix typo in generated PR
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Fix typo in generated PR title
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Fix typo in generated PR title
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Co-authored-by: Ignacio Rivas <rivasign@gmail.com>

.buildkite/scripts/steps/console_definitions_sync.sh

@@ -40,7 +40,7 @@ main () {
   git config --global user.name "$KIBANA_MACHINE_USERNAME"
   git config --global user.email '42973632+kibanamachine@users.noreply.github.com'
 
-  PR_TITLE="[Console] Update console definitions (${branch_name})"
+  PR_TITLE="[Console] Update console definitions (${BUILDKITE_BRANCH})"
   PR_BODY='This PR updates the console definitions to match the latest ones from the @elastic/elasticsearch-specification repo.'
 
   # Check if a PR already exists