Added unit tests for masked and unmodified error logging options

[bonnici]

Added some unit tests to cover the new error reporting options introduced in #6794. The transform case was already covered but I added two new tests for the unmodified and masked options.

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[glasser]

@bonnici This is great! I made two minor improvements:

• I changed the errors to be GraphQLErrors with "extensions" so that we can see that unmodified preserves extensions and masked removes them
• I changed one of the asserts to use toMatchInlineSnapshot, which has the advantage that if the test fails, you can run jest -u and it will update the source code to match the current version (which you can compare in git or whatever).