relay-compiler diagnostic errors logging improvements #4574
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Couple of improvements to relay compiler error output to address issues from #4571
Test Plan
Confirmed the new formatting of .print_without_source() is correct with no character ranges (tested via ValidationError since I'm not sure how to generate a DiagnosticsError, but this will no longer be triggered due to the summarization change):
Confirmed the count shows instead of the individual errors now:
Also confirmed that config errors still showed up correctly: