feat: Add embedded properties to Dashboard [DHIS2-18239]

[larshelge]

This PR adds a object EmbeddedDashboard properties to the Dashboard entity meant to represent an embedded dashboard.

• provider refers to the provider of embedded dashboards, and can be extended to Power BI, Tableau and the like later.
• id refers to the identifier of the embedded dashboard defined by the external provider.
• options refers to customization options from the embedded dashboard provider, and can be extended later.

Adds a system setting for enabling Superset embedded dashboards.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[larshelge]

I moved this PR to a new one due to the signed commit requirement in master.

https://github.com/dhis2/dhis2-core/pull/19016

[larshelge]

Merged the new PR now. Closing this PR.

https://github.com/dhis2/dhis2-core/pull/19016