[PLAT-5084] Stringify Mach exception code and subcode #827
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Goal
Mach exception codes and subcodes are sent by the kernel as 64-bit values.
These can be too large to be faithfully decoded by many JSON decoders and Javascript in particular, meaning they may not be displayed correctly in the dashboard.
Changeset
This change encodes the Mach exception code and subcode as strings containing hex representations.
Testing
Manually verified that reports still appear on the dashboard, and that the new values are rendered correctly.
This change is covered by the automated e2e tests, the relevant test case has been amended.