pr: Enable pr-tests.pl with suppressed diff output

[ChrisDryden]

This changes the patch to skip the test with a patch to override the diff functionality in the test to only output which test failed so now the output looks like this:

  FAIL: tests/pr/pr-tests
  =======================

  pr: test 1b: mismatch
  pr: test 1b.r: mismatch
  pr: test 1b.p: mismatch
  pr: test 1c: mismatch
  ...
  pr: test 1i failed: exit status mismatch:  expected 0, got 1
  pr: test 1j failed: exit status mismatch:  expected 0, got 1
  ...
  pr: test margin-0 passed.
  ...

This should allow us to work on fixing these issues in the pr tests in the CI while still having the same patch to not overwhelm the logs

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.
Note: The gnu test tests/pr/pr-tests was skipped on 'main' but is now failing.

[ChrisDryden]

Not sure what's going on with printf surprise