Add tests for sp res

[Lucrezia-Cester]

While checking the tests for spatial_resolution I noticed 2 functions were unused. I removed them.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
hazenlib
HazenTask.py	24	3	88%	29–31
__init__.py	147	38	74%	136, 140, 150, 155, 192, 199–204, 215, 218–225, 245–247, 265–267, 286–288, 297, 302, 308, 359, 379–381, 389–390, 394
exceptions.py	21	4	81%	17–21
relaxometry.py	317	90	72%	238–256, 630, 689–691, 745, 793–815, 833–848, 1173–1176, 1185–1188, 1200–1213, 1216–1221, 1233–1263
shapes.py	20	9	55%	13, 16, 24–29, 32
snr_map.py	108	5	95%	403, 408–410, 439
tools.py	84	8	90%	43–50, 92, 101, 117
hazenlib/tasks
ghosting.py	150	51	66%	18–32, 47, 109–110, 114, 124–125, 151–153, 170–172, 218–256
relaxometry.py	7	2	71%	10–11
slice_position.py	117	21	82%	31, 40–41, 103–104, 130, 210, 217–233
slice_width.py	359	52	86%	34–37, 107, 166–186, 451, 456–457, 463, 468, 530–531, 780–821
snr.py	163	66	60%	62–67, 161–179, 194–203, 221–231, 258–268, 273–283, 314–327, 332–340, 369–382
snr_map.py	7	7	0%	1–11
spatial_resolution.py	247	44	82%	36–39, 62, 147, 206, 332–368
task_acr_ghosting.py	116	42	64%	33–53, 91–93, 123–125, 161–194
task_acr_uniformity.py	89	32	64%	34–54, 121–138
uniformity.py	78	19	76%	42–45, 91–92, 99, 133–147
TOTAL	2070	493	76%

Tests	Skipped	Failures	Errors	Time
180	0 :zzz:	0 :x:	0 :fire:	2m 17s :stopwatch:

[Lucrezia-Cester]

Hi @laurencejackson, @heyhaleema, could you please review this PR?