RFR: 8308093: Disable language preview features use in JDK

Mon May 22 10:09:52 UTC 2023

This patch disables temporary use of language preview features in JDK.
Temporary enabled language preview features (to allow Pattern Matching for switch use in the Classfile API library) are no more necessary.
All redundant use of --enable-preview in the Classfile API tests are also removed.

Please review.

Thanks,
Adam

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Commit messages:
 - 8308093: Disable language preview features use in JDK

Changes: https://git.openjdk.org/jdk/pull/14076/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14076&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308093
  Stats: 24 lines in 12 files changed: 0 ins; 22 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14076.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14076/head:pull/14076

PR: https://git.openjdk.org/jdk/pull/14076