When a user specifies a Custom Resource Kind in a restore filter
policy (e.g., kinds: [MyCustomKind]), the discovery helper fails
to resolve it if the CRD hasn't been restored yet.
This adds a peek-and-map fallback: if a resource type in the
backup tarball doesn't match the resolved filters, Velero peeks
at the actual Kind of the first item in the tarball and matches
it against the user's original policy strings.
Signed-off-by: Adam Zhang <adam.zhang@broadcom.com>
Adam Zhang
0d6b5a4f9b