RFR: 8160974: [TESTBUG] Mark more headful tests with @key headful.

[Hohensee, Paul]

Please review this backport, which is part of the patch tail for https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3077.

This is a replacement patch for the one for which a review was requested in https://mail.openjdk.java.net/pipermail/jdk8u-dev/2020-October/012773.html.

As noted in a comment on the JBS issue, there are 59 tests that were in the original patch that are not present in 8u.

The patch is not clean because the 59 tests are omitted, and because of various context differences. The only substantive change is the addition of @headful, which doesn’t affect running any of the tests.

Thanks,
Paul