Add option to make autoprecompilation always show errors

[IanButterworth]

Autoprecompilation doesn't show errors by default, to reduce noise for people that use large default envs

  1 dependency errored. To see a full report either run `import Pkg; Pkg.precompile()` or load the package

With package precompilation taking a long time in some cases, it can be frustrating to wait for the error to throw again.

Pkg should either:

1. Expose a setting to always show errors
2. Always show errors (it now always shows warnings anyway so it might make sense to?)

[IanButterworth]

CI should always show errors

[IanButterworth]

Also, given how noisy Pkg.precompile is now when you interrupt it (it now shows all the nested interrupt errors as warninngs, where it used to be a clean stop) I think it also makes sense to show any errors when interrupted