Frontend Monitoring: Update regex to ignore options.customEndpoint (#96542)

* fix(GrafanaJavascriptAgentBackend): update regex to ignore options.customEndpoint

* update test

public/app/core/services/echo/backends/grafana-javascript-agent/GrafanaJavascriptAgentBackend.test.ts

@@ -92,7 +92,7 @@ describe('GrafanaJavascriptAgentEchoBackend', () => {
     expect(initializeFaroMock.mock.calls[0][0].transports?.length).toEqual(2);
     expect(initializeFaroMock.mock.calls[0][0].transports?.[0]).toBeInstanceOf(EchoSrvTransport);
     expect(initializeFaroMock.mock.calls[0][0].transports?.[0].getIgnoreUrls()).toEqual([
-      new RegExp('/*/log-grafana-javascript-agent/'),
+      /.*\/log-grafana-javascript-agent.*/,
       /.*.google-analytics.com*.*/,
       /.*.googletagmanager.com*.*/,
       /frontend-metrics/,

public/app/core/services/echo/backends/grafana-javascript-agent/GrafanaJavascriptAgentBackend.ts

@@ -1,4 +1,4 @@
-import { BuildInfo } from '@grafana/data';
+import { BuildInfo, escapeRegex } from '@grafana/data';
 import { BaseTransport, defaultInternalLoggerLevel } from '@grafana/faro-core';
 import {
   initializeFaro,
@@ -53,7 +53,12 @@ export class GrafanaJavascriptAgentBackend
   constructor(public options: GrafanaJavascriptAgentBackendOptions) {
     // configure instrumentations.
     const instrumentations: Instrumentation[] = [];
-    const ignoreUrls = [new RegExp(`/*${options.customEndpoint}/`), ...TRACKING_URLS, ...options.ignoreUrls];
+
+    const ignoreUrls = [
+      new RegExp(`.*${escapeRegex(options.customEndpoint)}.*`),
+      ...TRACKING_URLS,
+      ...options.ignoreUrls,
+    ];
 
     const transports: BaseTransport[] = [new EchoSrvTransport({ ignoreUrls })];