[jdk21u-dev] RFR: 8351086: (fc) Make java/nio/channels/FileChannel/BlockDeviceSize.java test manual

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport 08929134b3533362133139c4e964b1b28de6ebfb

Changes: https://git.openjdk.org/jdk21u-dev/pull/1708/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1708&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351086
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1708.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1708/head:pull/1708

PR: https://git.openjdk.org/jdk21u-dev/pull/1708