test: add description, fix linters

Author: ulitink

test/fixtures/inspector-instrumentation-breakpoint/dep.js

@@ -1 +1 @@
-console.log("dep loaded");
+console.log('dep loaded');

test/fixtures/inspector-instrumentation-breakpoint/main.js

@@ -1 +1 @@
-require("./dep");
+require('./dep');

test/known_issues/test-inspector-instrumentation-breakpoint.js

@@ -1,3 +1,6 @@
+// This test validates inspector's Debugger.setInstrumentationBreakpoint method.
+// Refs: https://github.com/nodejs/node/issues/31138
+
 'use strict';
 const common = require('../common');