Update sentry-javascript monorepo to v6 (#41991)

* Update sentry-javascript monorepo to v6

* Pass fetch implementation to FetchTransport and stub in unit tests

* kick drone

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

package.json

@@ -245,8 +245,8 @@
     "@react-aria/focus": "3.5.0",
     "@react-aria/overlays": "3.7.2",
     "@reduxjs/toolkit": "1.6.1",
-    "@sentry/browser": "5.25.0",
-    "@sentry/types": "5.24.2",
+    "@sentry/browser": "6.15.0",
+    "@sentry/types": "6.15.0",
     "@sentry/utils": "6.13.2",
     "@types/ol": "^6.5.1",
     "@visx/event": "2.1.0",