Enhance doctor Python version & OS version info + refactoring

[achidlow]

feat(doctor): use sys.version for fuller output (vs version_info tuple)

feat(doctor): use platform.platform() for more complete OS details

refactor(doctor,sandbox): move common docker compose version functionality out + other minor refactorings

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/algokit
__init__.py	15	7	53%	6–13, 17–24, 32–34
__main__.py	2	2	0%	1–3
src/algokit/cli
completions.py	108	1	99%	86
init.py	165	16	90%	56, 203–204, 235, 238–240, 251, 289, 326, 335–337, 340–345, 360
src/algokit/core
bootstrap.py	100	16	84%	74, 94, 149, 152, 158–172
click_extensions.py	47	20	57%	40–43, 50, 56, 67–68, 73–74, 79–80, 91, 104–114
conf.py	27	4	85%	12, 16, 24, 26
log_handlers.py	68	9	87%	44–45, 50–51, 63, 112–116, 125
proc.py	44	1	98%	94
sandbox.py	120	7	94%	87, 152, 168, 183–185, 200
TOTAL	1027	83	92%

Tests	Skipped	Failures	Errors	Time
120	0 💤	0 ❌	0 🔥	12.686s ⏱️