[BUG] Notifications dashboard doesn't install correctly in OSD

[derek-ho]

• build notifications dashboard
• install it into OSD
• See the following error:

curl: (7) Failed to connect to localhost port 5601 after 0 ms: Connection refused
{"type":"log","@timestamp":"2024-04-19T18:52:41Z","tags":["fatal","root"],"pid":2551,"message":"Error: Cannot find module '../../public/utils/constants'\nRequire stack:\n- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/plugins/notificationsDashboards/server/routes/configRoutes.js\n- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/plugins/notificationsDashboards/server/routes/index.js\n- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/plugins/notificationsDashboards/server/plugin.js\n- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/plugins/notificationsDashboards/server/index.js\n- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/src/core/server/
 FATAL  Error: Cannot find module '../../public/utils/constants'
Require stack:
- /home/runner/work/opensearch-dashboards-functional-test/opensearch-dashboards-functional-test/opensearch-dashboards-3.0.0/plugins/notificationsDashboards/server/routes/configRoutes.js
- 

Related PR:
#165

Discovered via: opensearch-project/opensearch-dashboards-functional-test#1146

[ruanyl]

I'm getting the same error, this seems related a recent commit 1fc2abe

[ruanyl]

cc @SuZhou-Joe @Hailong-am

[SuZhou-Joe]

Let me see.

[SuZhou-Joe]

@amsiglan Code from server directory should not rely on the code from public directory.

For the final build tar, the public directory of plugins will be bundled to target/{pluginId}.bundle.js, and server side's code won't be able to find the reference within public directory.

[Hailong-am]

this fixed by #189