RFR: 8351086: (fc) Make java/nio/channels/FileChannel/BlockDeviceSize.java test manual [v2]

[Brian Burkhalter]

> Change `BlockDeviceSize` to be a manual test for the time being.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8351086: Add a comment indicating that the test must be launched with sudo or equivalent

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23877/files
  - new: https://git.openjdk.org/jdk/pull/23877/files/d11f1c6e..be439b3c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23877&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23877&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23877.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23877/head:pull/23877

PR: https://git.openjdk.org/jdk/pull/23877