[Recorder] [Template] Fix browser test failure (#20203)

* fix test

* Update sdk/template/template/test/public/configurationClient.spec.ts

* missing recording

Author: HarshaNalluru

sdk/template/template/recordings/browsers/aad_configurationclient_functional_tests_getconfigurationsetting/recording_supports_tracing.json

@@ -88,6 +88,12 @@ describe("[AAD] ConfigurationClient functional tests", function () {
     // the `getConfigurationSetting` method is being traced correctly, that the
     // tracing span is properly parented and closed.
     it("supports tracing", async () => {
+      // Playback fails in the browser without the "HeaderlessMatcher"
+      //
+      // If-Modified-Since & If-None-Match headers are not present in the recording and the request in playback has these headers
+      // Proxy tool doesn't treat these headers differently, tries to match them with the headers in the recording, and fails.
+      // More details here - https://github.com/Azure/azure-sdk-tools/issues/2674
+      await recorder.setMatcher("HeaderlessMatcher");
       const key = assertEnvironmentVariable("APPCONFIG_TEST_SETTING_KEY");
       await assert.supportsTracing(
         (options) => client.getConfigurationSetting(key, options),