feat(misconf): Improving ignore experience

[simar7]

As discussed here: #2961 (comment)

Case sensitivity

5. The ignore check is case-sensitive. I think it should either be case-insensitive or report errors for anything it's told to ignore which doesn't match a known rule. This is especially easy to hit because the output doesn't include the ID, but it does include a URL which looks like it has the ID except that it's transformed to lower-case and won't have any effect in an ignore block unless you know to restore the expected case.

We should make the ignore checks case insensitive. Both AVD-TEST-1234 and avd-test-1234 should resolve in the same rule.

Adding information about ignores

6. Related to the previous point, it would also be useful if Trivy threw an error for any targeted ignore which didn't match an actual warning since that might indicate that you made a typo or a rule was renamed without a backwards mapping.

We can also explicitly add more information on which checks are being ignored.