Auto merge of #92214 - ehuss:submodule-bg-exit, r=Mark-Simulacrum

Error if submodule fetch fails.

In CI, if fetching a submodule fails, the script would exit successfully. Later parts of the build will fail due to the missing files, but it is a bit confusing, and I think it would be better to error out earlier.

The reason is that in bash, `wait` without arguments will exit 0 even if a background job exits with an error. The solution here is to wait on each individual job, which will return the exit code of the job.

This was encountered in #92177.

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