[develop] Fix Slurm reservation deletion command

[enrico-usai]

The right command is scontrol delete ReservationName=xxx and not scontrol delete reservation ReservationName=xxx.

Tests

• Manually tested in a running cluster.
• I found this issue by simulating a transition from scheduled to active Capacity Block

References

• Follow-up of [develop] Add support for Capacity Blocks for ML #591

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (88b61da) 90.90% compared to head (684cb29) 90.90%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #600   +/-   ##
========================================
  Coverage    90.90%   90.90%           
========================================
  Files           20       20           
  Lines         3134     3134           
========================================
  Hits          2849     2849           
  Misses         285      285           

Flag	Coverage Δ
unittests	90.90% <100.00%> (ø)

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Files	Coverage Δ
...rc/common/schedulers/slurm_reservation_commands.py	98.85% <100.00%> (ø)

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