[crac] RFR: 8364449: [CRaC] Launch new main outside of the core C/R body

[Timofei Pushkin]

New main is now launched after restoration completes solving the issues outlined in the JBS task.

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Commit messages:
 - Launch new main outside of the core C/R body

Changes: https://git.openjdk.org/crac/pull/253/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=253&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364449
  Stats: 412 lines in 5 files changed: 303 ins; 103 del; 6 mod
  Patch: https://git.openjdk.org/crac/pull/253.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/253/head:pull/253

PR: https://git.openjdk.org/crac/pull/253