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codeintel: API docs: wrap upload handling in a panic handler

Administrator requested to merge sg/apidocs-panic-handler into main

Created by: slimsag

WriteDocumentationPages is by far the most complex code path in the API docs logic, and it relies on a lot of concurrency / channels logic which is itself even more complex (see group_documentation.go).

It stands to reason that the biggest risk API docs could impose would be a bug failing to handle a specific LSIF bundle or similar. In this situation, I'd really rather not fail the entire LSIF upload. It'd be better if only API docs failed.

This achieves that by adding a panic handler for that code.

This prevents issues like https://github.com/sourcegraph/sourcegraph/issues/26218#issuecomment-946053814 from impacting LSIF uploads.

Signed-off-by: Stephen Gutekanst [email protected]

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