[jdk21u-dev] RFR: 8355569: Some nsk/jdi tests can glean the "main" thread by using the ClassPrepareEvent for the debuggee main class [v3]

[Goetz Lindenmaier]

> I backport this to keep the tests up to date and make later backports clean.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into goetz_backport_8355569
 - backport e2ae50d877b13b121912e2496af4b5209b315a05
 - Backport b7e8952ad6def4ebae8c8c3c04cf6793f472b029

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/2406/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/2406/files/2c5b571c..0665c39b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2406&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2406&range=01-02

  Stats: 1629 lines in 27 files changed: 1220 ins; 339 del; 70 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2406.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2406/head:pull/2406

PR: https://git.openjdk.org/jdk21u-dev/pull/2406