Document mysterious code

Author: belcar-s

src/tests/TestsDataProvider.ts

@@ -171,6 +171,7 @@ export default class TestsDataProvider implements TreeDataProvider<Element> {
     denoProcess.onStdout((line) => {
       // remove newline
       line = line.slice(0, -1);
+      // remove control (?) characters that make output colorful
       line = line.replace(
         // deno-lint-ignore no-control-regex
         /[\u001b\u009b][[\]#;?()]*(?:(?:(?:[^\W_]*;?[^\W_]*)\u0007)|(?:(?:[0-9]{1,4}(;[0-9]{0,4})*)?[~0-9=<>cf-nqrtyA-PRZ]))/g,