fix(shared/sentry-utils): Break circular import in before-send.browser

Because:
- before-send.browser.ts imported SentryConfigOpts and tagFxaName from
  '@fxa/shared/sentry-utils' (its own index). Webpack's circular-module
  handling left the re-exported bindings undefined in the content-server
  test bundle, which caused the mocha runner to never initialize (the
  'globalThis.runner is undefined' failure surfaced by the functional
  tests for content-server mocha tests, cookies disabled, and post-verify
  force password change).

This commit:
- Imports SentryConfigOpts directly from ./models/sentry-config-opts and
  tagFxaName directly from ./utils.

Author: dschom

libs/shared/sentry-utils/src/lib/before-send.browser.ts

@@ -1,5 +1,6 @@
 import { ErrorEvent, EventHint } from '@sentry/core';
-import { SentryConfigOpts, tagFxaName } from '@fxa/shared/sentry-utils';
+import { SentryConfigOpts } from './models/sentry-config-opts';
+import { tagFxaName } from './utils';
 
 // Internal flag to keep track of whether or not sentry is initialized
 let sentryEnabled = false;