feat(core): Support SuppressedError in LinkedErrors integration

[kunal649]

SuppressedError is what JS throws when a cleanup (using / Symbol.dispose) fails while another error is already in flight. It keeps both errors, error (the new one) and suppressed (the original), and it has no cause. because of that, LinkedErrors never saw them. In Sentry I only got the generic wrapper message, "An error was suppressed during disposal".
Take a look , how it looks today (node SDK):

This change makes aggregateExceptionsFromError also follow error and suppressed, the same way it already follows cause and errors[], both errors now show up as chained exceptions. If a SuppressedError has another SuppressedError inside, it goes down the chain too.

And one thing I'm not sure about: I did not set is_exception_group on the wrapper. From #10850 i understand that flag makes sentry ignore that entry for grouping and titles, and that was a problem for cause errors. But the wrapper here has a meaningless message, so maybe it should be a group. (happy to change it if you prefer.)

I added tests for both errors, nested SuppressedErrors, non-Error values, and an error that only has an error property (it must not be treated as a SuppressedError).

Fixes #8441

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Feat lacks integration coverage

Medium Severity

This feat only adds unit tests around applyAggregateErrorsToEvent with a fake SuppressedError. The testing conventions require at least one integration or E2E test for feat PRs. An end-to-end captureException case with a native SuppressedError, matching the existing AggregateError suites, is missing.

 

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