Use underlined links for opening the web browser in error messages

Nate Grahamrequested to merge
work/ngraham/links into master

While reviewing !1145 (merged), I noticed that we still use buttons to open the bug report URL in error message UIs.

These days, the HIG recommends using links rather than buttons to open a web page in the user's web browser.

Implement that. Here's an example:

Before After
Before After

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