Turn off trailing whitespace triming in strings (#10646)

We have tests with baselines that have trailing whitespaces. Our `trimTrailingWhitespace` setting means that those will get modified automatically, breaking those tests. To fix that, I implemented a vscode feature to avoid triming inside regex and strings, so let's use that.

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
   "files.trimTrailingWhitespace": true,
+  "files.trimTrailingWhitespaceInRegexAndStrings": false,
   "files.associations": {
     "*.*proj": "xml",
     "*.props": "xml",