Fix "Terminate and Relaunch" of groups that use adoptIfRunning #1318

[jukzi]

This was a race condition: RuntimeProcess.fTerminated was only set asynchronously, hindering relaunching the process, thinking it was already running.

Happened only for GroupLaunchElement.adoptIfRunning == true

fixes https://github.com/eclipse-platform/eclipse.platform/issues/1318

[github-actions[bot]]

Test Results

 1 737 files  ±0   1 737 suites  ±0   1h 27m 31s :stopwatch: - 13m 14s  3 972 tests ±0   3 949 :white_check_mark:  - 1   22 :zzz: ±0  1 :x: +1  12 513 runs  ±0  12 351 :white_check_mark:  - 1  161 :zzz: ±0  1 :x: +1 

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Results for commit faf27df4. ± Comparison against base commit a4776c2a.

:recycle: This comment has been updated with latest results.

[jukzi]

ignoring unrelated random fail ProcessConsoleManagerTests