git: openjdk/leyden: premain: Update README.md to describe JEP 483 workflow instead of "CacheDataStore" workflow; added test EndTrainingOnMethodEntry.java

[Ioi Lam]

Changeset: efca2b07
Branch: premain
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-03-03 18:04:39 +0000
URL:       https://git.openjdk.org/leyden/commit/efca2b07c45c9fc69eff83457e4fd07e1a51365e

Update README.md to describe JEP 483 workflow instead of "CacheDataStore" workflow; added test EndTrainingOnMethodEntry.java

! README.md
! src/hotspot/share/cds/cdsConfig.cpp
! src/hotspot/share/cds/metaspaceShared.cpp
+ test/hotspot/jtreg/runtime/cds/appcds/leyden/EndTrainingOnMethodEntry.java