Remove credentials from data source object when exported

[BionIT]

Is your feature request related to a problem? Please describe.

Remove credentials from data source object when exported

Describe the solution you'd like

Remove credentials from data source object when exported

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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[zhongnansu]

adding related issue
#1728
#4529

[zhongnansu]

Importing a data source object with credential field dropped will fail, because it fails basic input field validation. E.g.

        if (!username) {
          throw SavedObjectsErrorHelpers.createBadRequestError(
            '"auth.credentials.username" attribute is required'
          );
        }

We don't want to remove server side validation, just for this use case, and we also want to avoid exporting the hashed credential. After discussion with team, we decide to use a place holder value when exporting. cc: @BionIT @zengyan-amazon

current and expected behavior

Currently, data source saved object is exported as below

{
  "attributes": {
    "auth": {
      "credentials": {
        "password": "xxxxxxx(encrypted value)",
        "username": "any"
      },
      "type": "username_password"
    },
    "dataSourceVersion": "",
    "description": "",
    "endpoint": "https://search-new-m6-nbkrrsakxmzqk3oay3olromnzi.us-west-2.es.amazonaws.com/",
    "installedPlugins": [],
    "title": "test1"
  },
  "id": "18abe7e0-2297-11ef-b143-fdc11e1ac86d",
  "migrationVersion": {
    "data-source": "2.4.0"
  },
  "references": [],
  "type": "data-source",
  "updated_at": "2024-06-04T17:23:02.110Z",
  "version": "WzQsMV0="
}

We want to overwrite the credentials to use place holder value when exporting, so it will look like:

{
  "attributes": {
    "auth": {
      "type": "username_password",
        "credentials": {
            "password": "NEED_UPDATE_CREDENTIAL",
            "username": "NEED_UPDATE_CREDENTIAL"
      },
    },
    "dataSourceVersion": "",
    "description": "",
    "endpoint": "https://search-new-m6-nbkrrsakxmzqk3oay3olromnzi.us-west-2.es.amazonaws.com/",
    "installedPlugins": [],
    "title": "test1"
  },
  "id": "18abe7e0-2297-11ef-b143-fdc11e1ac86d",
  "migrationVersion": {
    "data-source": "2.4.0"
  },
  "references": [],
  "type": "data-source",
  "updated_at": "2024-06-04T17:23:02.110Z",
  "version": "WzQsMV0="
}