[FEATURE] Request to add recent alert to the new OSD homepage

[ruanyl]

Is your feature request related to a problem? Hey alert dashboards maintainers! The new homepage design requires to display a list of recent alerts on the homepage, as you can see on the screenshot:

What solution would you like? We released the new homepage without the alert card in 2.16 which based on top of a newly introduced content management plugin that allows multiple plugins to contribute contents to the same page.

The alert card is required for 2.17, below is a screenshot of the current version:

Basically, an alert card will be registered to homepage in the similar way as the workspace list card, you can refer to the workspace list card implementation here: https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/plugins/workspace/public/plugin.ts#L478

What alternatives have you considered? None

Do you have any additional context? Documentation of content management plugin: https://github.com/opensearch-project/OpenSearch-Dashboards/pull/7575/files

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Catch All Triage - 1, 2, 3

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@lezzago Is there a triage meeting for this repo? Please work with @krisfreedain to set one up.