RFR: 8343039: Remove jdk.internal.misc.InternalLock and usages from java.io

[Brian Burkhalter]

Uses of `InternalLock` are removed and `sycnhronized` is reinstated.

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Commit messages:
 - 8343039: Remove jdk.internal.misc.InternalLock and usages from java.io

Changes: https://git.openjdk.org/jdk/pull/22048/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22048&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343039
  Stats: 1379 lines in 11 files changed: 71 ins; 950 del; 358 mod
  Patch: https://git.openjdk.org/jdk/pull/22048.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22048/head:pull/22048

PR: https://git.openjdk.org/jdk/pull/22048