chore(examples): use httpResource api

[chintankavathia]

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Documentation.
Examples.
Dashboards Demo.
Playwright report.

Coverage Reports:

• charts-ng
• dashboards-ng
• element-ng
• element-translate-ng
• maps-ng
• native-charts-ng

[gemini-code-assist]

Code Review

This pull request refactors the SampleComponent to use Angular's new resource APIs instead of manually subscribing to HttpClient inside ngOnInit. However, the reviewer pointed out that httpResource does not have a .text() method and will fail to fetch markdown files as JSON. They suggested using the resource API from @angular/core in combination with HttpClient configured for plain text response instead.

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