Create a MutationsExceptionGroup from two lists of exceptions, representing
a larger set that has been truncated. The MutationsExceptionGroup will
contain the union of the two lists as sub-exceptions, and the error message
describe the number of exceptions that were truncated.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-12-19 UTC."],[],[]]