RFR: Remove Leyden experimental workflow

[Ioi Lam]

Remove the Leyden experimental workflow: `-XX:CacheDataStore` switch and friends.

We should be using the standard JEP 483/514 workflow for AOT cache.

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Commit messages:
 - Removed native code for handling Leyden experimental workflow
 - Remove leyden workflow from tests

Changes: https://git.openjdk.org/leyden/pull/83/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden&pr=83&range=00
  Stats: 669 lines in 25 files changed: 22 ins; 596 del; 51 mod
  Patch: https://git.openjdk.org/leyden/pull/83.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/83/head:pull/83

PR: https://git.openjdk.org/leyden/pull/83