Git - experimental input validation using diagnostics (#204822)

* Initial implementation

* Add setting + code actions

extensions/git/package.json

@@ -28,6 +28,7 @@
     "scmHistoryProvider",
     "scmMultiDiffEditor",
     "scmSelectedProvider",
+    "scmTextDocument",
     "scmValidation",
     "tabInputTextMerge",
     "timeline"
@@ -2748,6 +2749,11 @@
           "default": 50,
           "markdownDescription": "%config.inputValidationSubjectLength%"
         },
+        "git.experimental.inputValidation": {
+          "type": "boolean",
+          "default": false,
+          "description": "%config.inputValidation%"
+        },
         "git.detectSubmodules": {
           "type": "boolean",
           "scope": "resource",