git warnings show an error popup with cancel button

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Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.59.1
• OS Version: windows 10

Steps to Reproduce:

1. trigger a warning (ie. try to add a file with CRLF)

the icon should be more like

and the "Cancel" button should say "OK". arguably, they shouldn't even be modal popups and instead they should just appear as a notification on the bottom right

[eamodio]

This is a tricky one, since for some messages I agree, and other warrant a modal. Right now we don't distinguish between many types of possible errors

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another example:

this one is pretty bad because it's nonsensical for multiple reasons:

• clicking "cancel" stages the change anyway
• it says "the following paths" but doesn't actually include that part of the error

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