[crac] RFR: 8361124: [CRaC] Move recursive checkpoint test to simengine [v2]

[Timofei Pushkin]

> At the moment of creation this PR includes #239 — that should be merged first. fc33e85c429536dcc89ff59afed6450bb7562639 is the change of this PR.
> 
> Makes recursive checkpoint test use `simengine` instead of `pauseengine`. Since that was the only test using `pauseengine`, a separate `PauseEngineTest` is created to test the engine.

Timofei Pushkin has updated the pull request incrementally with one additional commit since the last revision:

  Improve exception handling in recursive C/R test

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Changes:
  - all: https://git.openjdk.org/crac/pull/240/files
  - new: https://git.openjdk.org/crac/pull/240/files/fc33e85c..d616ee8f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=240&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=240&range=00-01

  Stats: 67 lines in 1 file changed: 17 ins; 31 del; 19 mod
  Patch: https://git.openjdk.org/crac/pull/240.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/240/head:pull/240

PR: https://git.openjdk.org/crac/pull/240