Refactor shared functionality out of routes.py; documentation and test updates

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
api/core
routes.py	161	61	62%	33, 52, 73–79, 141–142, 233, 311–312, 404–405, 480–481, 566–567, 602–623, 643–668, 676–724
utils.py	176	40	77%	22, 28–35, 38–45, 69–80, 102–114, 141–145, 160–161, 278, 285–286, 346–347, 361–362, 371, 427, 497–501
api/core/database
models.py	43	12	72%	23–25, 28, 54–60, 63
satellite_access.py	32	23	28%	11–21, 25–32, 37–68
tle_access.py	53	12	77%	83–101, 140, 152, 163–164, 171–173
tests
conftest.py	15	1	93%	30
test_errors.py	25	8	68%	5, 8, 17, 19, 28, 30, 42, 44
TOTAL	925	157	83%

Tests	Skipped	Failures	Errors	Time
25	0 :zzz:	0 :x:	0 :fire:	27.908s :stopwatch: