Handle early shutdown in SSH executor

[tcompa]

Checklist before merging

• I added an appropriate entry to CHANGELOG.md
• I merged main into the current branch.

[github-actions]

Benchmark comparison

GET /api/alive/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
vanilla	0.9	0.9	1.00	0.0	0.0
power	0.8	0.8	1.00	0.0	0.0
dataset	0.8	0.8	1.00	0.0	0.0
project	0.8	0.9	0.89	0.0	0.0
job	0.8	0.8	1.00	0.0	0.0

GET /api/v2/dataset/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
vanilla	8.6	10.5	0.82	0.7	0.7
power	412.9	441.5	0.94	440.2	440.2
dataset	163.1	175.6	0.93	171.2	171.2
project	48.8	50.4	0.97	58.9	58.9
job	28.1	34.9	0.81	41.7	41.7

GET /api/v2/job/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
vanilla	5.8	6.7	0.87	2.2	2.2
power	137.8	145.0	0.95	652.0	652.0
dataset	138.9	145.7	0.95	904.8	904.8
project	47.5	50.8	0.94	283.7	283.7
job	38.8	41.6	0.93	224.8	224.8

GET /api/v2/project/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
vanilla	6.5	7.5	0.87	0.1	0.1
power	6.2	7.9	0.78	0.1	0.1
dataset	6.5	7.8	0.83	0.1	0.1
project	8.7	9.1	0.96	2.3	2.3
job	6.4	6.9	0.93	0.1	0.1

GET /api/v2/workflow/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
vanilla	11.2	12.0	0.93	0.8	0.8
power	26.1	26.0	1.00	29.8	29.8
dataset	21.8	21.0	1.04	17.1	17.1
project	26.3	24.3	1.08	21.5	21.5
job	10.8	15.7	0.69	0.9	0.9

POST /api/v2/project/3/dataset/404/images/query/

User	Time current (ms)	Time main (ms)	Ratio current/main	Size current (Kb)	Size main (Kb)
dataset	157.0	158.9	0.99	275.1	275.1

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
fractal_server/app/runner/executors/slurm/ssh
_executor_wait_thread.py
executor.py
fractal_server/app/runner/executors/slurm/sudo
executor.py
Project Total

This report was generated by python-coverage-comment-action