Filter the self-hosted changelogs from the in-product changelog

[loujaybee]

Features such as: https://www.gitpod.io/changelog/june-self-hosted-release should not show in the in-product changelog, we need to find a way to filter out these changelogs so they don't show in VS Code for users (as they're targeted at the installer persona's, not the end user developers).

CC: @lucasvaltl, @mrsimonemms

Relates to:

• Align in-product changelog version with self-hosted installation. #11641

[lucasvaltl]

The alternative would be to have a second changelog in the self-hosted docs section that just has notes about every release. I think this is what we had initially, but then moved it to the global changelog to increase visibility. This would not help with an past self-hosted changelogs though.

[stale]

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