Move get_solver test to more natural location #8855

Job	Run time
Check code is formatted (Black)	22s
Code linting (pylint)	5m 57s
pytest (user mode) (py3.9/linux)	36m 39s
Test notebooks (py3.9/linux)	5m 16s
Tests (py3.9/linux)	54m 16s
pytest (user mode) (py3.9/win64)	40m 23s
macOS setup (EXPERIMENTAL) (3.9)	1h 10m 56s
Test notebooks (py3.9/win64)	12m 24s
Tests (py3.9/win64)	1h 9m 44s
pytest (user mode) (py3.11/linux)	27m 19s
Test notebooks (py3.11/linux)	4m 49s
Tests (py3.10/linux)	47m 34s
pytest (user mode) (py3.11/win64)	43m 32s
Test notebooks (py3.11/win64)	13m 8s
Tests (py3.10/win64)	1h 25m 6s
Tests (py3.11/linux)	47m 12s
Tests (py3.11/win64)	1h 26m 43s
Upload coverage report (Codecov)	14s
	10h 51m 34s

Provide feedback