RFR: 8285034: Skip ServiceTest.testManyServicesRunConcurrently on Windows

[Ambarish Rapte]

The test ServiceTest.testManyServicesRunConcurrently fails intermittently on Windows platform with a time out error.
Test needs to be skipped until fixed.

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Commit messages:
 - skip-test

Changes: https://git.openjdk.java.net/jfx/pull/783/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=783&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285034
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/783.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/783/head:pull/783

PR: https://git.openjdk.java.net/jfx/pull/783