RFR: 8306571: [testbug] Skip Tree/TableViewResizeColumnToFitContentTest with fractional screen scale

[Andy Goryachev]

Skipping some checks in Tree/TableViewResizeColumnToFitContentTest on platforms with fractional screen scale, until JDK-8299753 gets implemented.

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Commit messages:
 - 8306571: using scalex
 - 8306571: skip tests with fractional screen scale
 - 8305709: skip when fractional scale

Changes: https://git.openjdk.org/jfx/pull/1105/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1105&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306571
  Stats: 42 lines in 3 files changed: 21 ins; 9 del; 12 mod
  Patch: https://git.openjdk.org/jfx/pull/1105.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1105/head:pull/1105

PR: https://git.openjdk.org/jfx/pull/1105