Add browser warning when <title> contains more than 1 child

[michaelboyles]

Summary

There is no browser warning when <title> contains multiple children. See #33341

There was an existing server-only warning which I applied to the client too

How did you test this change?

Added a unit test and added more assertions to existing tests

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[github-actions]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[michaelboyles]

bump

[github-actions]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[github-actions]

Closing this pull request after a prolonged period of inactivity. If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!