Add large-error-ignored config-knob

[lukaslueg]

Fixes #15404

changelog: [result_large_err]: Add large_error_ignored configuration

[rustbot]

r? @dswij

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They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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[dswij]

r? clippy

[llogiq]

I don't see anything wrong with this approach. r=me after a rebase.

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[lukaslueg]

@llogiq, can one still use r=... with the new merge queue? In any case: rebased.

[llogiq]

I can r=me whatever I want. I still have to merge manually.