docs: Add missing tests for comparing observables

[sonukapoor]

📚 Docs or angular.io bug report

Description

The examples used in the comparing-observables guide have no tests ensuring they are valid. Work can start after #34327 has been merged.

What's the affected URL?**

https://angular.io/guide/comparing-observables

[sonukapoor]

I will be working on this as soon as the other PR is in place.

[kapunahelewong]

This is wonderful! 🎉Thank you so much, @sonukapoor! If you need anything while working on the PR, feel free to tag me.

[gkalpak]

FYI: I moved this to comp: docs-infra, because this is about adding tests for the examples (and the necessary infrastructure changes to accomodate that).

[angular-robot]

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[gkalpak]

This has been addressed in #34537.

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