[BUG] Ad plugin registered api schema conflicts with alerting plugin

[Hailong-am]

What is the bug?

Ad plugin will register a custom api schema alertingPlugin during plugin setup, that have conflict with alerting plugin. They both using same namespace for the api schema.

anomaly-detection-dashboards-plugin/server/plugin.ts

Lines 80 to 83 in 0c16406

	if (dataSourceEnabled) {
	dataSource.registerCustomApiSchema(adPlugin);
	dataSource.registerCustomApiSchema(alertingPlugin);
	}

AD

anomaly-detection-dashboards-plugin/server/cluster/ad/alertingPlugin.ts

Lines 19 to 22 in 0c16406

	const ca = components.clientAction.factory;
	Client.prototype.alerting = components.clientAction.namespaceFactory();
	const alerting = Client.prototype.alerting.prototype;

Alerting

https://github.com/opensearch-project/alerting-dashboards-plugin/blob/82532860e740d260e281be4656ef47e4bbecf12b/server/clusters/alerting/alertingPlugin.js#L18-L21

By looking at the logic, the api schema may override each other that depends on plugin setup order.

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

What is the expected behavior?
A clear and concise description of what you expected to happen.

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?

This is only happened for multiple datasource case