fix type of testFailureExitCode config option

[k-rajat19]

Summary

According to types testFailureExitCode can also take string values.

Test plan

Green CI

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[SimenB]

That's just because all CLI arguments are strings. But we probably don't need to say that in the types, so real fix is probably to remove it from there?

[k-rajat19]

That's just because all CLI arguments are strings. But we probably don't need to say that in the types, so real fix is probably to remove it from there?

that sounds more reasonable but it will be breaking for those who are already passing string?
that's why I thought to make change in the doc instead of changing types 😅

[SimenB]

I doubt anybody's passing it, but if they do, it should be easy enough to change. This only changes the types anyways.

Mind adding a changelog entry?

[SimenB]

thanks!

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