[CI] Make format checker error message more user-friendly by using emoji (#9564)

This PR makes format checker error message more user-friendly by adding emojis.

format.sh

@@ -21,6 +21,20 @@ builtin cd "$(dirname "${BASH_SOURCE:-$0}")"
 ROOT="$(git rev-parse --show-toplevel)"
 builtin cd "$ROOT" || exit 1
 
+check_command() {
+    if ! command -v "$1" &> /dev/null; then
+        echo "❓❓$1 is not installed, please run \`pip install -r requirements-lint.txt\`"
+        exit 1
+    fi
+}
+
+check_command yapf
+check_command ruff
+check_command mypy
+check_command codespell
+check_command isort
+check_command clang-format
+
 YAPF_VERSION=$(yapf --version | awk '{print $2}')
 RUFF_VERSION=$(ruff --version | awk '{print $2}')
 MYPY_VERSION=$(mypy --version | awk '{print $2}')
@@ -31,7 +45,7 @@ CLANGFORMAT_VERSION=$(clang-format --version | awk '{print $3}')
 # # params: tool name, tool version, required version
 tool_version_check() {
     if [[ $2 != $3 ]]; then
-        echo "Wrong $1 version installed: $3 is required, not $2."
+        echo "❓❓Wrong $1 version installed: $3 is required, not $2."
         exit 1
     fi
 }
@@ -281,10 +295,12 @@ tools/actionlint.sh -color
 echo 'vLLM actionlint: Done'
 
 if ! git diff --quiet &>/dev/null; then
-    echo 'Reformatted files. Please review and stage the changes.'
-    echo 'Changes not staged for commit:'
-    echo
+    echo 
+    echo "🔍🔍There are files changed by the format checker or by you that are not added and committed:"
     git --no-pager diff --name-only
+    echo "🔍🔍Format checker passed, but please add, commit and push all the files above to include changes made by the format checker."
 
     exit 1
+else
+    echo "✨🎉 Format check passed! Congratulations! 🎉✨"
 fi