[github] GitHub Actions workflows changes (#65856)

- Remove usages of the non-existent `ignore-forks` field, conditions in
jobs already exist to prevent the jobs from running in forks.
- Don't use variables in the `printf` format string. Use `printf
"..%s.." "$foo"`. ([SC2059](https://www.shellcheck.net/wiki/SC2059))
- Double quote variable expansion to prevent globbing and word
splitting. ([SC2086](https://www.shellcheck.net/wiki/SC2086))
- Prefer `[ p ] || [ q ]` as `[ p -o q ]` is not well defined.
([SC2166](https://www.shellcheck.net/wiki/SC2166))
- Consider `{ cmd1; cmd2; } >> file` instead of individual redirects.
([SC2129](https://www.shellcheck.net/wiki/SC2129))
- Use `$(...)` notation instead of legacy notation `...`.
([SC2006](https://www.shellcheck.net/wiki/SC2006))
- Use `./*glob*` or `-- *glob*` so names with dashes won't become
options. ([SC2035](https://www.shellcheck.net/wiki/SC2035))
- Refactor JavaScript code in certain workflows.
- Change workflow variable substitution style of some workflows to be
consistent with others.
diff --git a/.github/workflows/issue-release-workflow.yml b/.github/workflows/issue-release-workflow.yml
index a4d4dd8..bd6d09c 100644
--- a/.github/workflows/issue-release-workflow.yml
+++ b/.github/workflows/issue-release-workflow.yml
@@ -55,9 +55,9 @@
 
       - name: Backport Commits
         run: |
-          printf "$COMMENT_BODY" |
+          printf "%s" "$COMMENT_BODY" |
           ./llvm/utils/git/github-automation.py \
-          --repo $GITHUB_REPOSITORY \
+          --repo "$GITHUB_REPOSITORY" \
           --token ${{ secrets.RELEASE_WORKFLOW_PUSH_SECRET }} \
           release-workflow \
           --issue-number ${{ github.event.issue.number }} \
@@ -84,9 +84,9 @@
 
       - name: Create Pull Request
         run: |
-          printf "$COMMENT_BODY" |
+          printf "%s" "$COMMENT_BODY" |
           ./llvm/utils/git/github-automation.py \
-          --repo $GITHUB_REPOSITORY \
+          --repo "$GITHUB_REPOSITORY" \
           --token ${{ secrets.RELEASE_WORKFLOW_PUSH_SECRET }} \
           release-workflow \
           --issue-number ${{ github.event.issue.number }} \