Build/Test Tools: Remove redundant escaping from the commit message that's passed to the Slack API.

This escaping is no longer needed since all instances of inline expressions were removed from workflows in r59679. The commit message can now be treated as a plain text string in an environment variable throughout the workflow.

Props johnbillion, swissspidy

Unprops johnblackbourn

See #62221


git-svn-id: https://develop.svn.wordpress.org/trunk@59920 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/slack-notifications.yml

@@ -135,6 +135,7 @@ jobs:
         with:
           retries: 2
           retry-exempt-status-codes: 418
+          result-encoding: string
           script: |
             const commit_details = await github.rest.repos.getCommit({
               owner: context.repo.owner,
@@ -143,18 +144,10 @@ jobs:
             });
             return commit_details.data.commit.message;
 
-      - name: Prepare commit message.
-        id: commit-message
-        run: |
-          # shellcheck disable=SC2016
-          COMMIT_MESSAGE="$(echo "${COMMIT_MSG_RAW}" | awk 'NR==1' | sed 's/`/\\`/g' | sed 's/\"/\\\\\\"/g' | sed 's/\$/\\$/g')"
-          echo "commit_message_escaped=${COMMIT_MESSAGE}" >> "$GITHUB_OUTPUT"
-        env:
-          COMMIT_MSG_RAW: ${{ ( github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' ) && fromJson( steps.current-commit-message.outputs.result ) || github.event.head_commit.message }}
-
       - name: Construct payload and store as an output
         id: create-payload
         run: |
+          COMMIT_MSG="$(echo "${COMMIT_MSG_RAW}" | awk 'NR==1')"
           PAYLOAD="$( jq \
             -n \
             --arg workflow_name "${GITHUB_WORKFLOW}" \
@@ -165,7 +158,7 @@ jobs:
           )"
           echo "payload=$PAYLOAD" >> "$GITHUB_OUTPUT"
         env:
-          COMMIT_MSG: ${{ steps.commit-message.outputs.commit_message_escaped }}
+          COMMIT_MSG_RAW: ${{ ( github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' ) && fromJson( steps.current-commit-message.outputs.result ) || github.event.head_commit.message }}
 
   # Posts notifications when a workflow fails.
   failure: