Refactor how we handle errors around imgtestInit/tryjobInit #149356
+205
−114
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I noticed that we don't really assert that these aren't called in ways that conflict with their internal logic, and that there were some redundant initializers and some race conditions. This patch makes it so that calling them reentrantly is always safe and always returns the same future, while also explicitly asserting that they're not called in conflicting ways.
Diff is much more readable if you enable "ignore whitespace changes".