Git-extras blame mode is not synced across a few blob views on the page

Created by: taras-yemets

Changing git blame mode when references file preview is open breaks git-extras extension.

ensure "experimentalFeatures": { "coolCodeIntel": true } feature flag is enabled (https://github.com/sourcegraph/sourcegraph/pull/30095)
open any file
enable git blame for the whole file
click on a code token, wait for a code intel popup and click "Find references" button
in the references tab click on any reference body to see the file preview
ensure that git blame decorations are present in the file preview
disable git blame by clicking on the extension icon
ensure that blame decorations have disappeared from the references tab file preview but remain on the main blob view

Blame decorations are not visible for the references tab file preview but still remain on the main blob view. Extension icon is inactive.

Git blame decoration state is shared between the blob views: both are either visible or not. Extension icon reflects the next blame mode correctly.

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