FR: export `testthat::snapshot_review()` about devtools HOT 2 CLOSED

This is the devtools package, so it's not the right place.

But these functions should already be avialable to you because by default load_all() will attach testthat.

from devtools.

Oh I opened this FR in response to an issue of having clickable hyperlinks not working with the Run Tests button.
r-lib/testthat#1846

The this worfklow

1. get a warning that a snapshot test is failing or you just restarted session.
2. go to that test location
3. Click the run tests button
4. In this case, since load_all() was not run. snapshot_review()can't autocomplete. hence the need to typetestthat::snapshot_review()` by hand (because testthat is not loaded)

However, devtools is loaded in r profile per https://usethis.r-lib.org/reference/rprofile-helper.html?q=rprofi#null
hence the reasoning behind this FR

from devtools.