update default os to be ubuntu24

[Azreen Zaman (azreenz)]

Update each nodearray ImageName to be ubuntu 24 in slurm template.

[Copilot]

Pull request overview

Updates the Slurm cluster template’s default OS image to Ubuntu 24.04 by switching the DefaultValue for all node role image parameters from cycle.image.ubuntu22 to cycle.image.ubuntu24, aligning the template’s defaults with the intended new baseline.

Changes:

• Set SchedulerImageName default to cycle.image.ubuntu24
• Set defaults for LoginImageName, HPCImageName, HTCImageName, GPUImageName, and DynamicImageName to cycle.image.ubuntu24

Criterion	Max Points	Points Awarded	Notes
PR Description Accuracy	20	20	Description matches the template default image updates.
PR Atomicity	20	20	Single, focused change to defaults.
Logical Implementation	10	10	Straightforward value updates.
Regression Risk	10	10	No logic changes; only default selection updated.
Exception Handling	10	10	Not applicable (no code paths added/changed).
Code Comments	10	10	Not applicable (no comment/doc changes required).
Repetitive Code	10	10	No duplicated logic introduced.
Spelling	5	5	No spelling issues found in changed lines.
Logging Quality	5	5	Not applicable.

FINAL SCORE: 100/100

RECOMMENDATION: MERGE
RATIONALE: The PR cleanly updates the default image for all relevant node image parameters and matches the stated intent.
BLOCKERS: None