[jdk19] RFR: 8290252: Add TEST.properties to java/nio/channels/FileChannel and move tests out of largeMemory sub-dir

[Brian Burkhalter]

Attempt to make `FIleChannel` tests not run concurrently with each other.

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Commit messages:
 - 8290252: Add TEST.properties to java/nio/channels/FileChannel and move tests out of largeMemory sub-dir

Changes: https://git.openjdk.org/jdk19/pull/139/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=139&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290252
  Stats: 1 line in 3 files changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/139.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/139/head:pull/139

PR: https://git.openjdk.org/jdk19/pull/139