[Fleet] Enable package signature verification feature #137239
Merged
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Summary
Closes #133822
Enable the package signature verification feature by default.
Package signature verification allows users to better trust the contents of packages. When package registry v2 is launched all packages will be accompanied by a .sig file generated by elastic. Enabling the feature flag means that all packages with a signature available will have the package zip checked against this signature.
If a package fails verification then the user will be alerted in the UI.
If a package does not have a signature, the package will be marked as having an "unknown" verification status, which currently does not show in the UI. This prevents already installed packages from showing as unverified.