extension_ci: Improve title formatting (#45870)

Finn Evers created 

Just some minor formatting touchups I noticed after the first rollout

Release Notes:

- N/A

Change summary

.github/workflows/extension_workflow_rollout.yml                | 4 +-
tooling/xtask/src/tasks/workflows/extension_workflow_rollout.rs | 2 
2 files changed, 3 insertions(+), 3 deletions(-)

Detailed changes

.github/workflows/extension_workflow_rollout.yml 🔗 

@@ -81,11 +81,11 @@ jobs:
       uses: peter-evans/create-pull-request@v7
       with:
         path: extension
-        title: Update CI workflows to zed@${{ steps.short-sha.outputs.sha_short }}
+        title: Update CI workflows to `zed@${{ steps.short-sha.outputs.sha_short }}`
         body: |
           This PR updates the CI workflow files from the main Zed repository
           based on the commit zed-industries/zed@${{ github.sha }}
-        commit-message: Update CI workflows to zed@${{ steps.short-sha.outputs.sha_short }}
+        commit-message: Update CI workflows to `zed@${{ steps.short-sha.outputs.sha_short }}`
         branch: update-workflows
         committer: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>
         author: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>

tooling/xtask/src/tasks/workflows/extension_workflow_rollout.rs 🔗 

@@ -106,7 +106,7 @@ fn rollout_workflows_to_extension(fetch_repos_job: &NamedJob) -> NamedJob {
     }
 
     fn create_pull_request(token: &StepOutput, short_sha: StepOutput) -> Step<Use> {
-        let title = format!("Update CI workflows to zed@{}", short_sha);
+        let title = format!("Update CI workflows to `zed@{}`", short_sha);
 
         named::uses("peter-evans", "create-pull-request", "v7")
             .add_with(("path", "extension"))