fix: require an inclusion promise when log integration time is used #1247
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See sigstore/protobuf-specs#442: this strengthens the inclusion promise requirement to make it mandatory when the log integration time is used as the common verification time.
This should be a non-breaking change in principle, although in practice there might be some real-world bundles that have the inclusion promises stripped from them (similar to what we saw with bundles that had inclusion proofs but no signed checkpoints). The conformance test should determine this, since it includes all CPython bundles.
Edit: conformance passes, indicating that we're OK in terms of existing bundles having inclusion promises.
CC @haydentherapper