fix: handle child layouts (#2853) (CP: 24.5)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (24.5@66d1f37). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...e-router/src/runtime/RouterConfigurationBuilder.ts	90.47%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 24.5 #2905 +/- ## ======================================= Coverage ? 92.24% ======================================= Files ? 81 Lines ? 2681 Branches ? 699 ======================================= Hits ? 2473 Misses ? 158 Partials ? 50 ``` | [Flag](https://app.codecov.io/gh/vaadin/hilla/pull/2905/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/vaadin/hilla/pull/2905/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin) | `92.24% <90.47%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin#carryforward-flags-in-the-pull-request-comment) to find out more.

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[sonarcloud[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 SonarQube Cloud

[vaadin-bot]

This ticket/PR has been released with Hilla 24.5.5.