RFR: CODETOOLS-7903471: JMH: Add test for virtual threads executor [v7]

[Sergey Kuksenko]

> Add test for virtual thread executor

Sergey Kuksenko has updated the pull request incrementally with one additional commit since the last revision:

  fix errata

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Changes:
  - all: https://git.openjdk.org/jmh/pull/103/files
  - new: https://git.openjdk.org/jmh/pull/103/files/ac024b56..be16ffbe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmh&pr=103&range=06
 - incr: https://webrevs.openjdk.org/?repo=jmh&pr=103&range=05-06

  Stats: 20 lines in 2 files changed: 0 ins; 15 del; 5 mod
  Patch: https://git.openjdk.org/jmh/pull/103.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/103/head:pull/103

PR: https://git.openjdk.org/jmh/pull/103