RFR: 8346972: Test java/nio/channels/FileChannel/LoopingTruncate.java fails sometimes with IOException: There is not enough space on the disk

[Volkan Yazıcı]

Switches from using the temporary directory to work directory in `LoopingTruncate`. This should effectively provide sufficient space for the test finish. Solution is tipped by @bplb. `tier1,2` tests' results will be attached to the ticket once they finish.

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Commit messages:
 - Switch from using the temporary directory to work directory in `LoopingTruncate`

Changes: https://git.openjdk.org/jdk/pull/23011/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23011&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346972
  Stats: 10 lines in 1 file changed: 5 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23011.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23011/head:pull/23011

PR: https://git.openjdk.org/jdk/pull/23011