[jdk21u-dev] RFR: 8315241: (fs) Move toRealPath tests in java/nio/file/Path/Misc.java to separate JUnit 5 test

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport dd64a4a483a831fd66912491af10502c4cf8596b

Changes: https://git.openjdk.org/jdk21u-dev/pull/184/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315241
  Stats: 334 lines in 2 files changed: 191 ins; 141 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/184.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/184/head:pull/184

PR: https://git.openjdk.org/jdk21u-dev/pull/184