[Infra UI] Use the official KibanaThemeProvider in the logs and metrics apps

[weltenwort]

📓 Summary

In order to support the new theming mechanism of EUI we need to include the recently added <KibanaThemeProvider> in the app component hierarchy.

part of #118866

✔️ Acceptance criteria

• The renderApp functions of the logs app wraps the hierarchy into a <KibanaThemeProvider> with props from the core theme$ argument.
• The renderApp functions of the metrics app wraps the hierarchy into a <KibanaThemeProvider> with props from the core theme$ argument.

💡 Implementation hints

• [meta] Adapt all existing applications to use the new KibanaThemeProvider #118866 provides a bit of example code
• for now the styled theme provider will have to coexist with this new theme provider until all styled components usage has been replaced with emotion in a follow-up

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)