RFR: 8307076: gradle test should always run tests

[Kevin Rushforth]

"gradle test" won't rerun a test that has already passed. This is surprising behavior, especially for UI toolkit tests where there might be many reasons to want to run the tests again, even if none of that tests "inputs" have changed. This is especially bothersome when debugging an intermittent test failure. Unlike rebuilding the JavaFX runtime or the docs, where there is no need to rerun a task that was successful if none of the inputs to that task have changed, I expect gradle to run my test when I tell it to.

This PR will make test tasks always run when specified.

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Commit messages:
 - 8307076: gradle test should always run tests

Changes: https://git.openjdk.org/jfx/pull/1120/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1120&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307076
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1120.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1120/head:pull/1120

PR: https://git.openjdk.org/jfx/pull/1120