simplify hyperion restart

[rtuck99]

Fixes

• simplify hyperion_restart() for blueapi #1737
• Restarting GDA server appears to kill off hyperion-blueapi #1739

Also requires

• https://gerrit.diamond.ac.uk/c/gda/gda-mx/+/44987

Link to dodal PR (if required): #N/A

As used from GDA, hyperion_restart() should always kill all hyperion processes, however separate launching of supervisor and blueapi is retained for use direct from the command line via run_hyperion.sh.
Blueapi is now started in a separate process group to avoid being sent the SIGINT by gda_launcher which was terminating the process on GDA server shutdown.

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (e82beb7) to head (96627e3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1744   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files         164      164           
  Lines        8918     8918           
=======================================
  Hits         8296     8296           
  Misses        622      622           

Components	Coverage Δ
i24 SSX	77.15% <ø> (ø)
hyperion	98.74% <ø> (ø)
other	98.16% <ø> (ø)

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[adaudon]

Looks good. Is it not possible or unnecessary to add testing for bash scripts like this?

[rtuck99]

Looks good. Is it not possible or unnecessary to add testing for bash scripts like this?

Traditionally we haven't had unit tests for bash scripts, I suppose in theory it might be possible to test bash scripts, although I haven't looked into what frameworks exist for it. In general it's fairly complicated as we don't currently have any infrastructure for it.

Long term we are looking to move away from this though as once containerised we won't need complex bash scripts like this.