fix: only init rum if prerendered page becomes active

[kptdobe]

To avoid collecting to many data, rum needs to be initialised only when prerendered pages become active. See https://github.com/adobe/aem-lib/issues/101.

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Commits

* [3d8918e](https://github.com/adobe/helix-website/commit/3d8918e8a80c85466ed7136794fce32ee1ed2011) :white_check_mark: (latest)

[trieloff]

As I've said on the other issue and PR, this is a reporting issue, not a data collection issue. We should exclude bundles that are pre-rendered only from the count of page views, but we may want to continue counting them for things like content requests.

[kptdobe]

I agree with @trieloff.