Fix automatic CSP hash update

The problem was that whenever the hashe needed an update, the current
patch would create a conflict which cannot be easily auto-resolved.

Instead, put the hashes in a separate patch that is deleted and
regenerated each time, avoiding the conflicts.

Also the web worker iframe hash was not being updated.

patches/series

@@ -24,3 +24,4 @@ trusted-domains.diff
 signature-verification.diff
 copilot.diff
 app-name.diff
+csp-hashes.diff