fix(admin-server): Add @fxa/shared/sentry-node path to tsconfig.build.json

Because:
- nest build uses tsconfig.build.json which has an explicit paths map;
  @fxa/shared/sentry-node was missing from this override, causing the
  admin-server audit-tokens script to fail to resolve the module during
  the CI Build step even though tsc --noEmit succeeded.

This commit:
- Adds the @fxa/shared/sentry-node path entry alongside sentry-nest and
  sentry-utils

Author: dschom

packages/fxa-admin-server/tsconfig.build.json

@@ -43,6 +43,7 @@
       "@fxa/shared/notifier": ["libs/shared/notifier/src/index"],
       "@fxa/shared/mozlog": ["libs/shared/mozlog/src/index"],
       "@fxa/shared/sentry-nest": ["libs/shared/sentry-nest/src/index"],
+      "@fxa/shared/sentry-node": ["libs/shared/sentry-node/src/index"],
       "@fxa/shared/sentry-utils": ["libs/shared/sentry-utils/src/index"],
       "@fxa/accounts/rate-limit": ["libs/accounts/rate-limit/src/index"]
     }