Include conditions from code in related location error messages

[keyboardDrummer]

In #5983 some code was commented out. It seems like this code was not running for either IDE or CLI, since it was guarded by !showSnippets && token.IncludesRange. For the IDE the !showSnippets condition was always false and for the CLI either of the two would be false.

This PR uncomments the code and sets showSnippets to false instead of true for the IDE, which I think only affects this one piece of code.

What was changed?

• Remove the field TranslatorFlags.ReportRanges and related code, since it was unused.
• Instead of this is the postcondition that could not be proved, say this postcondition might not hold: {postcondition},
• Instead of this proposition could not be proved, say could not prove: {condition}

How has this been tested?

• Many IDE and CLI tests test this behavior and they have been updated

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.