[jfx-tests] RFR: 8315845: Exclude Scenegraph and Charts test classes that serve as a base class

[Ajit Ghaisas]

A few SceneGraphTests and ControlsTests/chart test classes are abstract classes and serve as base classes for other tests.
They are excluded from test execution and hence result in avoiding false failure reports.

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Commit messages:
 - 8315845 - exclude base class tests

Changes: https://git.openjdk.org/jfx-tests/pull/4/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx-tests&pr=4&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315845
  Stats: 11 lines in 4 files changed: 11 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx-tests/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/jfx-tests.git pull/4/head:pull/4

PR: https://git.openjdk.org/jfx-tests/pull/4