docs: add commit input validation in vscode settings

previously vscode used to warn about commit lines when they exceed certain characters but this was
changed to be off by default, lets explicitly add this to vscode settings so it aligns with our
contributing docment that no line should 100 characters

.vscode/settings.json

@@ -24,5 +24,8 @@
   "editor.rulers": [100],
   "bazel.buildifierExecutable": "node_modules/.bin/buildifier",
   "bazel.buildifierFixOnFormat": true,
-  "bazel.executable": "node_modules/.bin/bazel"
+  "bazel.executable": "node_modules/.bin/bazel",
+  "git.inputValidation": true,
+  "git.inputValidationSubjectLength": 100,
+  "git.inputValidationLength": 100
 }