[release/6.0] Provide locations for src-gen diagnostic output #61614
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Backport of #61430 to release/6.0
Customer Impact
Provides locations for diagnostics emitted by the JSON source generator to allow users to navigate to warning/error sites in VS and view them in the command line. Lack of this support was reported in #60314.
Regression
Not a regression but regarded as an important enhancement for users of the source generator.
Testing
There are tests for the locations of the emitted diagnostics included.
Risk
Low, there are defensive checks to insure we don't leak exceptions while trying to fetch the locations from Roslyn metadata.