[CI] test:all should also check/fix format (google#1811)

package.json

@@ -8,6 +8,7 @@
     "_cd:docs": "cd userguide &&",
     "_check:format": "npx prettier --check .??* *.md",
     "_cp:bs-rfs": "npx cpy 'node_modules/bootstrap/scss/vendor/*' assets/_vendor/bootstrap/scss/",
+    "_diff:check": "git diff --name-only --exit-code",
     "_mkdir:hugo-mod": "npx mkdirp ../github.com/FortAwesome/Font-Awesome ../github.com/twbs/bootstrap",
     "_prebuild": "npm run _cp:bs-rfs",
     "_test:docs": "npm run cd:docs test",
@@ -29,7 +30,7 @@
     "preserve": "npm run _prebuild",
     "pretest": "npm run _prebuild",
     "serve": "npm run cd:docs serve",
-    "test:all": "npm run _test:docs && npm run check",
+    "test:all": "npm run _test:docs && npm run check && npm run fix:format && npm run _diff:check",
     "test": "npm run _test:docs",
     "update:pkg:dep": "npm install --save-exact @fortawesome/fontawesome-free@latest bootstrap@latest",
     "update:pkg:hugo": "npm install --save-exact -D hugo-extended@latest"