Add spell check for changed files (Azure#20822)

* Add spell check for changed files

* task -> template

* Add exceptions

Author: danieljurek

.vscode/cspell.json

@@ -25,9 +25,13 @@
   ],
   // cspell is not case sensitive
   // Sort words alphabetically to make this list easier to use
-  "words": [],
+  "words": ["azsdk", "pwsh"],
   "overrides": [
-    { "filename": "**/sdk/formrecognizer/**/*.cs", "words": ["ZhHant"] }
+    { "filename": "**/sdk/formrecognizer/**/*.cs", "words": ["ZhHant"] },
+    {
+      "filename": "**/eng/pipelines/templates/jobs/ci.yml",
+      "words": ["warnaserror"]
+    }
   ],
   "allowCompoundWords": true
 }

eng/pipelines/templates/jobs/ci.yml

@@ -103,6 +103,7 @@ jobs:
       name: azsdk-pool-mms-ubuntu-1804-general
       vmImage: MMSUbuntu18.04
     steps:
+      - template: /eng/common/pipelines/templates/steps/check-spelling.yml
       - task: UsePythonVersion@0
         displayName: "Use Python 3.6"
         inputs: