Do not include image annotations when building spec

These annotations can have security implications - crun, for
example, allows rootless containers to preserve the user's groups
through an annotation. We absolutely should not include
annotations from an untrusted image off the internet by default.

We may consider whitelisting some annotations (e.g. the legacy
WASM annotations), but given that there is now a more explicit
way of specifying an image uses the WASM runtime in the OCI image
spec, I'm just tearing this out entirely for now.

Signed-off-by: Matt Heon <mheon@redhat.com>
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