GH Actions - Update direct usage of GitHub context in workflows + Upd…

…ate Code owners (#8995)

.github/CODEOWNERS

@@ -2,5 +2,5 @@
 
 # Each line is a file pattern followed by one or more owners.
 
-# Harmony owns any files in the .github directory at the root of the repository and any of its subdirectories.
-/.github/ @Automattic/harmony
+# Transact architecture - DevOps owns any files in the .github directory at the root of the repository and any of its subdirectories.
+/.github/ @Automattic/transact-architecture-devops

.github/workflows/post-release-updates.yml

@@ -139,8 +139,8 @@ jobs:
           NEXT_RELEASE_VERSION: ${{ steps.next-version.outputs.NEXT_RELEASE_VERSION }}
         run: |
           cd wiki
-          git config user.name "${{ github.actor }}"
-          git config user.email "${{ github.actor }}@users.noreply.github.com"
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
           
           HAS_CHANGES=false
           

.github/workflows/release-code-freeze.yml

@@ -116,7 +116,7 @@ jobs:
                   "type": "section",
                   "text": {
                     "type": "mrkdwn",
-                    "text": "• Created a release branch `release/${{ env.RELEASE_VERSION }}` \n • Raised a <https://github.com/Automattic/woocommerce-payments/pull/${{ env.RELEASE_PR_ID }}|Pull Request> to `trunk`\n • Built a <https://github.com/Automattic/woocommerce-payments/actions/runs/${{ github.run_id }}|zip file and ran smoke tests> against it"
+                    "text": "• Created a release branch `release/${{ env.RELEASE_VERSION }}` \n • Raised a <https://github.com/Automattic/woocommerce-payments/pull/${{ env.RELEASE_PR_ID }}|Pull Request> to `trunk`\n • Built a <https://github.com/Automattic/woocommerce-payments/actions/runs/$GITHUB_RUN_ID|zip file and ran smoke tests> against it"
                   }
                 },
                 {

changelog/gh-actions-fix-script-injection-vulnerabilities

@@ -0,0 +1,5 @@
+Significance: patch
+Type: dev
+Comment: Update direct usage of GitHub contexts on workflows
+
+