BREAKING(report): Drop support for `EXCEPTIONS` from results

[simar7]

It's reasonable to drop support for Exceptions since:

1. No other scanner uses it today. So the concept of Exceptions only exists in misconfiguration scanning. I believe the original concept originated from conftest but we have diverged quite a bit from that now in Trivy.
2. The fact that it isn't very useful once we start to hide misconfigurations, if they are ignored.

~It will obviously be a breaking change that we will need to announce.~

Relevant discussion https://github.com/aquasecurity/trivy/discussions/7474

Originally posted by @simar7 in https://github.com/aquasecurity/trivy/pull/7171#discussion_r1680555960