[dashboard] Disable UI experiments for self-hosted

[JanKoehnlein]

UI experiments (#7081) allow us to gather user data on alternatives for the UI. But they for self-hosted installations, we should rather provide a single UI flow. Let's disable experiments for SH.

[JanKoehnlein]

/schedule

[roboquat]

@JanKoehnlein: Issue scheduled in the meta team (WIP: 0)

In response to this:

/schedule

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[geropl]

One way would be to have a enableUiExperiments API call that defaults to false, and is configurable per Config.

To not force every client to ask for this on every page load we could cache this in localStorage (together with a timestamp), e.g., and only refresh every day or so.

[JanKoehnlein]

/assign

[JanKoehnlein]

I think we implement do that in a simpler way. As these experiments really only make sense for us to drive product decisions. So checking the URL should be sufficient.