Quick check to circumvent regex in many cases (microsoft#164815)

* Quick check to circumvent regex in many cases

* Fix logic

Author: lramos15

src/vs/platform/telemetry/common/telemetryUtils.ts

@@ -287,6 +287,11 @@ export function getPiiPathsFromEnvironment(paths: IPathEnvironment): string[] {
  */
 function anonymizeFilePaths(stack: string, cleanupPatterns: RegExp[]): string {
 
+	// Fast check to see if it is a file path to avoid doing unnecessary heavy regex work
+	if (!stack || (!stack.includes('/') && !stack.includes('\\'))) {
+		return stack;
+	}
+
 	let updatedStack = stack;
 
 	const cleanUpIndexes: [number, number][] = [];